[PATCH v3 0/8] riscv: resolve most warnings from sparse

[PATCH v3 0/8] riscv: resolve most warnings from sparse

[Paul Walmsley]

Resolve most warnings from the 'sparse' static analysis tool for the
arch/riscv codebase.  This makes life easier for us as maintainers,
and makes it easier for developers to use static analysis tools on
their own changes.

This third version drops the patch that adds one of the
__riscv_cmodel* preprocessor definitions, and uses __visible for C
functions called only by assembly code - both based on some guidance
from Luc Van Oostenryck.

This patch series incorporates some changes based on feedback from
Christoph Hellwig <hch@lst.de> and Luc Van Oostenryck
<luc.vanoostenryck@gmail.com>.

Applies on the current riscv fixes branch that is based on v5.4-rc3.

- Paul


Paul Walmsley (8):
  riscv: add prototypes for assembly language functions from entry.S
  riscv: add prototypes for assembly language functions from head.S
  riscv: init: merge split string literals in preprocessor directive
  riscv: add missing prototypes
  riscv: mark some code and data as file-static
  riscv: add missing header file includes
  riscv: fp: add missing __user pointer annotations
  riscv: for C functions called only from assembly, mark with __visible

Kernel object size difference:
  text	   data	    bss	    dec	    hex	filename
6664246	2136664	 312608	9113518	 8b0fae	vmlinux.rv64.orig
6664178	2136632	 312608	9113418	 8b0f4a	vmlinux.rv64.patched
6444536	1797560	 255184	8497280	 81a880	vmlinux.rv32.orig
6444492	1797536	 255184	8497212	 81a83c	vmlinux.rv32.patched

 arch/riscv/include/asm/irq.h        |  6 ++++++
 arch/riscv/include/asm/pgtable.h    |  2 ++
 arch/riscv/include/asm/processor.h  |  4 ++++
 arch/riscv/include/asm/ptrace.h     |  2 ++
 arch/riscv/include/asm/smp.h        |  2 ++
 arch/riscv/include/asm/switch_to.h  |  1 +
 arch/riscv/kernel/cpufeature.c      |  1 +
 arch/riscv/kernel/entry.h           | 29 +++++++++++++++++++++++++++++
 arch/riscv/kernel/head.h            | 21 +++++++++++++++++++++
 arch/riscv/kernel/module-sections.c |  1 +
 arch/riscv/kernel/process.c         |  2 ++
 arch/riscv/kernel/ptrace.c          |  4 ++--
 arch/riscv/kernel/reset.c           |  1 +
 arch/riscv/kernel/setup.c           |  2 ++
 arch/riscv/kernel/signal.c          |  6 ++++--
 arch/riscv/kernel/smp.c             |  2 ++
 arch/riscv/kernel/smpboot.c         |  3 +++
 arch/riscv/kernel/stacktrace.c      |  6 ++++--
 arch/riscv/kernel/syscall_table.c   |  1 +
 arch/riscv/kernel/time.c            |  1 +
 arch/riscv/kernel/traps.c           |  2 ++
 arch/riscv/kernel/vdso.c            |  3 ++-
 arch/riscv/mm/context.c             |  1 +
 arch/riscv/mm/fault.c               |  2 ++
 arch/riscv/mm/init.c                | 17 ++++++++++-------
 arch/riscv/mm/sifive_l2_cache.c     |  2 +-
 26 files changed, 109 insertions(+), 15 deletions(-)
 create mode 100644 arch/riscv/kernel/entry.h
 create mode 100644 arch/riscv/kernel/head.h

-- 
2.23.0


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[PATCH v3 1/8] riscv: add prototypes for assembly language functions from entry.S

[Paul Walmsley]

Add prototypes for assembly language functions defined in entry.S,
and include these prototypes into C source files that call those
functions.

This patch resolves the following warnings from sparse:

arch/riscv/kernel/signal.c:32:53: warning: incorrect type in initializer (different address spaces)
arch/riscv/kernel/signal.c:45:23: warning: incorrect type in initializer (different address spaces)
arch/riscv/kernel/signal.c:59:53: warning: incorrect type in initializer (different address spaces)
arch/riscv/kernel/signal.c:69:23: warning: incorrect type in initializer (different address spaces)
arch/riscv/kernel/signal.c:89:48: warning: incorrect type in argument 2 (different address spaces)
arch/riscv/kernel/signal.c:142:45: warning: incorrect type in argument 2 (different address spaces)
arch/riscv/kernel/signal.c:295:17: warning: symbol 'do_notify_resume' was not declared. Should it be static?
arch/riscv/kernel/traps.c:91:1: warning: symbol 'do_trap_unknown' was not declared. Should it be static?
arch/riscv/kernel/traps.c:93:1: warning: symbol 'do_trap_insn_misaligned' was not declared. Should it be static?
arch/riscv/kernel/traps.c:95:1: warning: symbol 'do_trap_insn_fault' was not declared. Should it be static?
arch/riscv/kernel/traps.c:97:1: warning: symbol 'do_trap_insn_illegal' was not declared. Should it be static?
arch/riscv/kernel/traps.c:99:1: warning: symbol 'do_trap_load_misaligned' was not declared. Should it be static?
arch/riscv/kernel/traps.c:101:1: warning: symbol 'do_trap_load_fault' was not declared. Should it be static?
arch/riscv/kernel/traps.c:103:1: warning: symbol 'do_trap_store_misaligned' was not declared. Should it be static?
arch/riscv/kernel/traps.c:105:1: warning: symbol 'do_trap_store_fault' was not declared. Should it be static?
arch/riscv/kernel/traps.c:107:1: warning: symbol 'do_trap_ecall_u' was not declared. Should it be static?
arch/riscv/kernel/traps.c:109:1: warning: symbol 'do_trap_ecall_s' was not declared. Should it be static?
arch/riscv/kernel/traps.c:111:1: warning: symbol 'do_trap_ecall_m' was not declared. Should it be static?
arch/riscv/kernel/traps.c:125:17: warning: symbol 'do_trap_break' was not declared. Should it be static?
arch/riscv/kernel/traps.c:163:13: warning: symbol 'trap_init' was not declared. Should it be static?

This change should have no functional impact.

Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
---
 arch/riscv/kernel/entry.h  | 29 +++++++++++++++++++++++++++++
 arch/riscv/kernel/signal.c |  2 ++
 arch/riscv/kernel/traps.c  |  2 ++
 3 files changed, 33 insertions(+)
 create mode 100644 arch/riscv/kernel/entry.h

diff --git a/arch/riscv/kernel/entry.h b/arch/riscv/kernel/entry.h
new file mode 100644
index 000000000000..73bfcda993d0
--- /dev/null
+++ b/arch/riscv/kernel/entry.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2019 SiFive, Inc.
+ */
+#ifndef __ASM_ENTRY_H
+#define __ASM_ENTRY_H
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+
+asmlinkage void do_trap_unknown(struct pt_regs *regs);
+asmlinkage void do_trap_insn_misaligned(struct pt_regs *regs);
+asmlinkage void do_trap_insn_fault(struct pt_regs *regs);
+asmlinkage void do_trap_insn_illegal(struct pt_regs *regs);
+asmlinkage void do_trap_load_misaligned(struct pt_regs *regs);
+asmlinkage void do_trap_load_fault(struct pt_regs *regs);
+asmlinkage void do_trap_store_misaligned(struct pt_regs *regs);
+asmlinkage void do_trap_store_fault(struct pt_regs *regs);
+asmlinkage void do_trap_ecall_u(struct pt_regs *regs);
+asmlinkage void do_trap_ecall_s(struct pt_regs *regs);
+asmlinkage void do_trap_ecall_m(struct pt_regs *regs);
+asmlinkage void do_trap_break(struct pt_regs *regs);
+
+asmlinkage void do_notify_resume(struct pt_regs *regs,
+				 unsigned long thread_info_flags);
+
+void __init trap_init(void);
+
+#endif /* __ASM__H */
diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c
index b14d7647d800..85c700ad47e9 100644
--- a/arch/riscv/kernel/signal.c
+++ b/arch/riscv/kernel/signal.c
@@ -17,6 +17,8 @@
 #include <asm/switch_to.h>
 #include <asm/csr.h>
 
+#include "entry.h"
+
 #define DEBUG_SIG 0
 
 struct rt_sigframe {
diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index 1ac75f7d0bff..eff679c3b618 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -19,6 +19,8 @@
 #include <asm/ptrace.h>
 #include <asm/csr.h>
 
+#include "entry.h"
+
 int show_unhandled_signals = 1;
 
 extern asmlinkage void handle_exception(void);
-- 
2.23.0


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Re: [PATCH v3 1/8] riscv: add prototypes for assembly language functions from entry.S

[Christoph Hellwig]

On Fri, Oct 18, 2019 at 01:08:34AM -0700, Paul Walmsley wrote:
> Add prototypes for assembly language functions defined in entry.S,
> and include these prototypes into C source files that call those
> functions.
> 
> This patch resolves the following warnings from sparse:
> 
> arch/riscv/kernel/signal.c:32:53: warning: incorrect type in initializer (different address spaces)

I don't see how adding prototypes will fix an address space warning.

> +asmlinkage void do_trap_unknown(struct pt_regs *regs);
> +asmlinkage void do_trap_insn_misaligned(struct pt_regs *regs);
> +asmlinkage void do_trap_insn_fault(struct pt_regs *regs);
> +asmlinkage void do_trap_insn_illegal(struct pt_regs *regs);
> +asmlinkage void do_trap_load_misaligned(struct pt_regs *regs);
> +asmlinkage void do_trap_load_fault(struct pt_regs *regs);
> +asmlinkage void do_trap_store_misaligned(struct pt_regs *regs);
> +asmlinkage void do_trap_store_fault(struct pt_regs *regs);
> +asmlinkage void do_trap_ecall_u(struct pt_regs *regs);
> +asmlinkage void do_trap_ecall_s(struct pt_regs *regs);
> +asmlinkage void do_trap_ecall_m(struct pt_regs *regs);
> +asmlinkage void do_trap_break(struct pt_regs *regs);

All these are not defined in entry.S, but called from entry.S.

And as Luc pointed out last time the easiest way to fix the sparse
warnings is to add __visible to the definitions of those functions.

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Re: [PATCH v3 1/8] riscv: add prototypes for assembly language functions from entry.S

[Paul Walmsley]

On Fri, 18 Oct 2019, Christoph Hellwig wrote:

> On Fri, Oct 18, 2019 at 01:08:34AM -0700, Paul Walmsley wrote:
> > Add prototypes for assembly language functions defined in entry.S,
> > and include these prototypes into C source files that call those
> > functions.
> > 
> > This patch resolves the following warnings from sparse:
> > 
> > arch/riscv/kernel/signal.c:32:53: warning: incorrect type in initializer (different address spaces)
> 
> I don't see how adding prototypes will fix an address space warning.

You're right - that was a cut-and-paste error on my part.

[ ... ]
> All these are not defined in entry.S, but called from entry.S.

Indeed.  After reviewing this patch closely, I've just dropped it, and 
used __visible for just about everything.  All that is reflected in the v4 
series.

Thanks for the review.

- Paul

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[PATCH v3 2/8] riscv: add prototypes for assembly language functions from head.S

[Paul Walmsley]

Add prototypes for assembly language functions defined in head.S,
and include these prototypes into C source files that call those
functions.

This patch resolves the following warnings from sparse:

arch/riscv/kernel/setup.c:39:10: warning: symbol 'hart_lottery' was not declared. Should it be static?
arch/riscv/kernel/setup.c:42:13: warning: symbol 'parse_dtb' was not declared. Should it be static?
arch/riscv/kernel/smpboot.c:33:6: warning: symbol '__cpu_up_stack_pointer' was not declared. Should it be static?
arch/riscv/kernel/smpboot.c:34:6: warning: symbol '__cpu_up_task_pointer' was not declared. Should it be static?
arch/riscv/kernel/smpboot.c:133:24: warning: symbol 'smp_callin' was not declared. Should it be static?
arch/riscv/mm/fault.c:25:17: warning: symbol 'do_page_fault' was not declared. Should it be static?

This change should have no functional impact.

Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
---
 arch/riscv/kernel/head.h    | 21 +++++++++++++++++++++
 arch/riscv/kernel/setup.c   |  2 ++
 arch/riscv/kernel/smpboot.c |  2 ++
 arch/riscv/mm/fault.c       |  2 ++
 arch/riscv/mm/init.c        |  2 ++
 5 files changed, 29 insertions(+)
 create mode 100644 arch/riscv/kernel/head.h

diff --git a/arch/riscv/kernel/head.h b/arch/riscv/kernel/head.h
new file mode 100644
index 000000000000..105fb0496b24
--- /dev/null
+++ b/arch/riscv/kernel/head.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2019 SiFive, Inc.
+ */
+#ifndef __ASM_HEAD_H
+#define __ASM_HEAD_H
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+
+extern atomic_t hart_lottery;
+
+asmlinkage void do_page_fault(struct pt_regs *regs);
+asmlinkage void __init setup_vm(uintptr_t dtb_pa);
+
+extern void *__cpu_up_stack_pointer[];
+extern void *__cpu_up_task_pointer[];
+
+void __init parse_dtb(void);
+
+#endif /* __ASM_HEAD_H */
diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index a990a6cb184f..845ae0e12115 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -24,6 +24,8 @@
 #include <asm/tlbflush.h>
 #include <asm/thread_info.h>
 
+#include "head.h"
+
 #ifdef CONFIG_DUMMY_CONSOLE
 struct screen_info screen_info = {
 	.orig_video_lines	= 30,
diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index 18ae6da5115e..59fa59e013d4 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -30,6 +30,8 @@
 #include <asm/sections.h>
 #include <asm/sbi.h>
 
+#include "head.h"
+
 void *__cpu_up_stack_pointer[NR_CPUS];
 void *__cpu_up_task_pointer[NR_CPUS];
 static DECLARE_COMPLETION(cpu_running);
diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
index 96add1427a75..247b8c859c44 100644
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c
@@ -18,6 +18,8 @@
 #include <asm/ptrace.h>
 #include <asm/tlbflush.h>
 
+#include "../kernel/head.h"
+
 /*
  * This routine handles page faults.  It determines the address and the
  * problem, and then passes it off to one of the appropriate routines.
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 83f7d12042fb..fa8748a74414 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -19,6 +19,8 @@
 #include <asm/pgtable.h>
 #include <asm/io.h>
 
+#include "../kernel/head.h"
+
 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
 							__page_aligned_bss;
 EXPORT_SYMBOL(empty_zero_page);
-- 
2.23.0


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[PATCH v3 3/8] riscv: init: merge split string literals in preprocessor directive

[Paul Walmsley]

sparse complains loudly when string literals associated with
preprocessor directives are split into multiple, separately quoted
strings across different lines:

arch/riscv/mm/init.c:341:9: error: Expected ; at the end of type declaration
arch/riscv/mm/init.c:341:9: error: got "not use absolute addressing."
arch/riscv/mm/init.c:358:9: error: Trying to use reserved word 'do' as identifier
arch/riscv/mm/init.c:358:9: error: Expected ; at end of declaration
[ ... ]

Existing Linux practice is simply to use a single long line.  So, fix
by concatenating the strings.

This patch should have no functional impact.

Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
Reviewed-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Link: https://lore.kernel.org/linux-riscv/CAAhSdy2nX2LwEEAZuMtW_ByGTkHO6KaUEvVxRnba_ENEjmFayQ@mail.gmail.com/T/#mc1a58bc864f71278123d19a7abc083a9c8e37033
---
 arch/riscv/mm/init.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index fa8748a74414..fe68e94ea946 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -339,8 +339,7 @@ static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
  */
 
 #ifndef __riscv_cmodel_medany
-#error "setup_vm() is called from head.S before relocate so it should "
-	"not use absolute addressing."
+#error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
 #endif
 
 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
-- 
2.23.0


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Re: [PATCH v3 3/8] riscv: init: merge split string literals in preprocessor directive

[Christoph Hellwig]

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

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[PATCH v3 4/8] riscv: add missing prototypes

[Paul Walmsley]

sparse identifies these missing prototypes when building arch/riscv:

arch/riscv/kernel/cpu.c:149:29: warning: symbol 'cpuinfo_op' was not declared. Should it be static?
arch/riscv/kernel/irq.c:27:29: warning: symbol 'do_IRQ' was not declared. Should it be static?
arch/riscv/kernel/irq.c:57:13: warning: symbol 'init_IRQ' was not declared. Should it be static?
arch/riscv/kernel/syscall_table.c:15:6: warning: symbol 'sys_call_table' was not declared. Should it be static?
arch/riscv/kernel/time.c:15:13: warning: symbol 'time_init' was not declared. Should it be static?
arch/riscv/kernel/smpboot.c:135:24: warning: symbol 'smp_callin' was not declared. Should it be static?
arch/riscv/kernel/smp.c:72:5: warning: symbol 'setup_profiling_timer' was not declared. Should it be static?
arch/riscv/mm/init.c:151:7: warning: symbol 'trampoline_pg_dir' was not declared. Should it be static?
arch/riscv/mm/init.c:157:7: warning: symbol 'early_pg_dir' was not declared. Should it be static?
arch/riscv/kernel/process.c:32:6: warning: symbol 'show_regs' was not declared. Should it be static?

Fix by adding the missing prototypes to the appropriate header files.

This change should have no functional impact.

Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
---
 arch/riscv/include/asm/irq.h       | 3 +++
 arch/riscv/include/asm/pgtable.h   | 2 ++
 arch/riscv/include/asm/processor.h | 4 ++++
 arch/riscv/include/asm/ptrace.h    | 2 ++
 arch/riscv/include/asm/smp.h       | 2 ++
 5 files changed, 13 insertions(+)

diff --git a/arch/riscv/include/asm/irq.h b/arch/riscv/include/asm/irq.h
index 75576424c0f7..589e2d9fb2a6 100644
--- a/arch/riscv/include/asm/irq.h
+++ b/arch/riscv/include/asm/irq.h
@@ -12,6 +12,9 @@
 void riscv_timer_interrupt(void);
 void riscv_software_interrupt(void);
 
+asmlinkage void do_IRQ(struct pt_regs *regs);
+void __init init_IRQ(void);
+
 #include <asm-generic/irq.h>
 
 #endif /* _ASM_RISCV_IRQ_H */
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 42292d99cc74..7fc5e4a56715 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -61,6 +61,8 @@
 
 #define PAGE_TABLE		__pgprot(_PAGE_TABLE)
 
+extern pgd_t trampoline_pg_dir[];
+extern pgd_t early_pg_dir[];
 extern pgd_t swapper_pg_dir[];
 
 /* MAP_PRIVATE permissions: xwr (copy-on-write) */
diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
index f539149d04c2..ab56435de629 100644
--- a/arch/riscv/include/asm/processor.h
+++ b/arch/riscv/include/asm/processor.h
@@ -78,6 +78,10 @@ int riscv_of_processor_hartid(struct device_node *node);
 
 extern void riscv_fill_hwcap(void);
 
+extern const struct seq_operations cpuinfo_op;
+
+void time_init(void);
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* _ASM_RISCV_PROCESSOR_H */
diff --git a/arch/riscv/include/asm/ptrace.h b/arch/riscv/include/asm/ptrace.h
index d48d1e13973c..c851c095b674 100644
--- a/arch/riscv/include/asm/ptrace.h
+++ b/arch/riscv/include/asm/ptrace.h
@@ -101,6 +101,8 @@ static inline unsigned long regs_return_value(struct pt_regs *regs)
 	return regs->a0;
 }
 
+void show_regs(struct pt_regs *regs);
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* _ASM_RISCV_PTRACE_H */
diff --git a/arch/riscv/include/asm/smp.h b/arch/riscv/include/asm/smp.h
index a83451d73a4e..d19dd2e2e1da 100644
--- a/arch/riscv/include/asm/smp.h
+++ b/arch/riscv/include/asm/smp.h
@@ -15,6 +15,8 @@
 struct seq_file;
 extern unsigned long boot_cpu_hartid;
 
+asmlinkage void __init smp_callin(void);
+
 #ifdef CONFIG_SMP
 /*
  * Mapping between linux logical cpu index and hartid.
-- 
2.23.0


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Re: [PATCH v3 4/8] riscv: add missing prototypes

[Christoph Hellwig]

On Fri, Oct 18, 2019 at 01:08:37AM -0700, Paul Walmsley wrote:
> 
> diff --git a/arch/riscv/include/asm/irq.h b/arch/riscv/include/asm/irq.h
> index 75576424c0f7..589e2d9fb2a6 100644
> --- a/arch/riscv/include/asm/irq.h
> +++ b/arch/riscv/include/asm/irq.h
> @@ -12,6 +12,9 @@
>  void riscv_timer_interrupt(void);
>  void riscv_software_interrupt(void);
>  
> +asmlinkage void do_IRQ(struct pt_regs *regs);

This is another __visible candidate.

> +void __init init_IRQ(void);

This one is called by the core kernel.  Please instead lift the
extern in init/main.c to include/linux/irq.h or some other suitable
header insted of working around the issue in arch code.

> index f539149d04c2..ab56435de629 100644
> --- a/arch/riscv/include/asm/processor.h
> +++ b/arch/riscv/include/asm/processor.h
> @@ -78,6 +78,10 @@ int riscv_of_processor_hartid(struct device_node *node);
>  
>  extern void riscv_fill_hwcap(void);
>  
> +extern const struct seq_operations cpuinfo_op;

Another generic issue, Ben Dooks has started looking into it already.

> +
> +void time_init(void);

And another one that needs to be solved globally and not worked around
in the architecture.

> diff --git a/arch/riscv/include/asm/ptrace.h b/arch/riscv/include/asm/ptrace.h
> index d48d1e13973c..c851c095b674 100644
> --- a/arch/riscv/include/asm/ptrace.h
> +++ b/arch/riscv/include/asm/ptrace.h
> @@ -101,6 +101,8 @@ static inline unsigned long regs_return_value(struct pt_regs *regs)
>  	return regs->a0;
>  }
>  
> +void show_regs(struct pt_regs *regs);

Again, this needs to go into a common header, no arch code.

> +
>  #endif /* __ASSEMBLY__ */
>  
>  #endif /* _ASM_RISCV_PTRACE_H */
> diff --git a/arch/riscv/include/asm/smp.h b/arch/riscv/include/asm/smp.h
> index a83451d73a4e..d19dd2e2e1da 100644
> --- a/arch/riscv/include/asm/smp.h
> +++ b/arch/riscv/include/asm/smp.h
> @@ -15,6 +15,8 @@
>  struct seq_file;
>  extern unsigned long boot_cpu_hartid;
>  
> +asmlinkage void __init smp_callin(void);

One more __visible candidate.

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[PATCH v3 5/8] riscv: mark some code and data as file-static

[Paul Walmsley]

Several functions and arrays which are only used in the files in which
they are declared are missing "static" qualifiers.  Warnings for these
symbols are reported by sparse:

arch/riscv/kernel/stacktrace.c:22:14: warning: symbol 'walk_stackframe' was not declared. Should it be static?
arch/riscv/kernel/vdso.c:28:18: warning: symbol 'vdso_data' was not declared. Should it be static?
arch/riscv/mm/init.c:42:6: warning: symbol 'setup_zero_page' was not declared. Should it be static?
arch/riscv/mm/init.c:152:7: warning: symbol 'fixmap_pte' was not declared. Should it be static?
arch/riscv/mm/init.c:211:7: warning: symbol 'trampoline_pmd' was not declared. Should it be static?
arch/riscv/mm/init.c:212:7: warning: symbol 'fixmap_pmd' was not declared. Should it be static?
arch/riscv/mm/init.c:219:7: warning: symbol 'early_pmd' was not declared. Should it be static?
arch/riscv/mm/sifive_l2_cache.c:145:12: warning: symbol 'sifive_l2_init' was not declared. Should it be static?

Resolve these warnings by marking them as static.

Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
---
 arch/riscv/kernel/stacktrace.c  |  6 ++++--
 arch/riscv/kernel/vdso.c        |  2 +-
 arch/riscv/mm/init.c            | 12 +++++++-----
 arch/riscv/mm/sifive_l2_cache.c |  2 +-
 4 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/arch/riscv/kernel/stacktrace.c b/arch/riscv/kernel/stacktrace.c
index 0940681d2f68..fd908baed51c 100644
--- a/arch/riscv/kernel/stacktrace.c
+++ b/arch/riscv/kernel/stacktrace.c
@@ -19,8 +19,10 @@ struct stackframe {
 	unsigned long ra;
 };
 
-void notrace walk_stackframe(struct task_struct *task, struct pt_regs *regs,
-			     bool (*fn)(unsigned long, void *), void *arg)
+static void notrace walk_stackframe(struct task_struct *task,
+				    struct pt_regs *regs,
+				    bool (*fn)(unsigned long, void *),
+				    void *arg)
 {
 	unsigned long fp, sp, pc;
 
diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c
index c9c21e0d5641..e24fccab8185 100644
--- a/arch/riscv/kernel/vdso.c
+++ b/arch/riscv/kernel/vdso.c
@@ -25,7 +25,7 @@ static union {
 	struct vdso_data	data;
 	u8			page[PAGE_SIZE];
 } vdso_data_store __page_aligned_data;
-struct vdso_data *vdso_data = &vdso_data_store.data;
+static struct vdso_data *vdso_data = &vdso_data_store.data;
 
 static int __init vdso_init(void)
 {
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index fe68e94ea946..79cfb35f1e0e 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -40,7 +40,7 @@ static void __init zone_sizes_init(void)
 	free_area_init_nodes(max_zone_pfns);
 }
 
-void setup_zero_page(void)
+static void setup_zero_page(void)
 {
 	memset((void *)empty_zero_page, 0, PAGE_SIZE);
 }
@@ -150,7 +150,7 @@ EXPORT_SYMBOL(pfn_base);
 void *dtb_early_va;
 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
-pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
+static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
 static bool mmu_enabled;
 
 #define MAX_EARLY_MAPPING_SIZE	SZ_128M
@@ -209,15 +209,17 @@ static void __init create_pte_mapping(pte_t *ptep,
 
 #ifndef __PAGETABLE_PMD_FOLDED
 
-pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
-pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
+static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
+static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
 
 #if MAX_EARLY_MAPPING_SIZE < PGDIR_SIZE
 #define NUM_EARLY_PMDS		1UL
 #else
 #define NUM_EARLY_PMDS		(1UL + MAX_EARLY_MAPPING_SIZE / PGDIR_SIZE)
 #endif
-pmd_t early_pmd[PTRS_PER_PMD * NUM_EARLY_PMDS] __initdata __aligned(PAGE_SIZE);
+
+#define NUM_EARLY_PMDS_PTRS	(PTRS_PER_PMD * NUM_EARLY_PMDS)
+static pmd_t early_pmd[NUM_EARLY_PMDS_PTRS] __initdata __aligned(PAGE_SIZE);
 
 static pmd_t *__init get_pmd_virt(phys_addr_t pa)
 {
diff --git a/arch/riscv/mm/sifive_l2_cache.c b/arch/riscv/mm/sifive_l2_cache.c
index 2e637ad71c05..a9ffff3277c7 100644
--- a/arch/riscv/mm/sifive_l2_cache.c
+++ b/arch/riscv/mm/sifive_l2_cache.c
@@ -142,7 +142,7 @@ static irqreturn_t l2_int_handler(int irq, void *device)
 	return IRQ_HANDLED;
 }
 
-int __init sifive_l2_init(void)
+static int __init sifive_l2_init(void)
 {
 	struct device_node *np;
 	struct resource res;
-- 
2.23.0


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Re: [PATCH v3 5/8] riscv: mark some code and data as file-static

[Christoph Hellwig]

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

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Re: [PATCH v3 5/8] riscv: mark some code and data as file-static

[Greentime Hu]

Paul Walmsley <paul.walmsley@sifive.com> 於 2019年10月19日 週六 下午3:58寫道：
>
> Several functions and arrays which are only used in the files in which
> they are declared are missing "static" qualifiers.  Warnings for these
> symbols are reported by sparse:
>
> arch/riscv/kernel/stacktrace.c:22:14: warning: symbol 'walk_stackframe' was not declared. Should it be static?
> arch/riscv/kernel/vdso.c:28:18: warning: symbol 'vdso_data' was not declared. Should it be static?
> arch/riscv/mm/init.c:42:6: warning: symbol 'setup_zero_page' was not declared. Should it be static?
> arch/riscv/mm/init.c:152:7: warning: symbol 'fixmap_pte' was not declared. Should it be static?
> arch/riscv/mm/init.c:211:7: warning: symbol 'trampoline_pmd' was not declared. Should it be static?
> arch/riscv/mm/init.c:212:7: warning: symbol 'fixmap_pmd' was not declared. Should it be static?
> arch/riscv/mm/init.c:219:7: warning: symbol 'early_pmd' was not declared. Should it be static?
> arch/riscv/mm/sifive_l2_cache.c:145:12: warning: symbol 'sifive_l2_init' was not declared. Should it be static?
>
> Resolve these warnings by marking them as static.
>
> Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
> ---
>  arch/riscv/kernel/stacktrace.c  |  6 ++++--
>  arch/riscv/kernel/vdso.c        |  2 +-
>  arch/riscv/mm/init.c            | 12 +++++++-----
>  arch/riscv/mm/sifive_l2_cache.c |  2 +-
>  4 files changed, 13 insertions(+), 9 deletions(-)
>
> diff --git a/arch/riscv/kernel/stacktrace.c b/arch/riscv/kernel/stacktrace.c
> index 0940681d2f68..fd908baed51c 100644
> --- a/arch/riscv/kernel/stacktrace.c
> +++ b/arch/riscv/kernel/stacktrace.c
> @@ -19,8 +19,10 @@ struct stackframe {
>         unsigned long ra;
>  };
>
> -void notrace walk_stackframe(struct task_struct *task, struct pt_regs *regs,
> -                            bool (*fn)(unsigned long, void *), void *arg)
> +static void notrace walk_stackframe(struct task_struct *task,
> +                                   struct pt_regs *regs,
> +                                   bool (*fn)(unsigned long, void *),
> +                                   void *arg)

I think walk_stackframe() could not be static because it will be used
in perf_callchain.c.

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Re: [PATCH v3 5/8] riscv: mark some code and data as file-static

[Paul Walmsley]

[-- Attachment #1: Type: text/plain, Size: 617 bytes --]

On Wed, 23 Oct 2019, Greentime Hu wrote:

> Paul Walmsley <paul.walmsley@sifive.com> 於 2019年10月19日 週六 下午3:58寫道：
> >
> > Several functions and arrays which are only used in the files in which
> > they are declared are missing "static" qualifiers.  Warnings for these
> > symbols are reported by sparse:
> >
> > arch/riscv/kernel/stacktrace.c:22:14: warning: symbol 'walk_stackframe' was not declared. Should it be static?

[ ... ]

> I think walk_stackframe() could not be static because it will be used
> in perf_callchain.c.

Thanks Greentime - will update the patch.


- Paul

[-- Attachment #2: Type: text/plain, Size: 161 bytes --]

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[PATCH v3 6/8] riscv: add missing header file includes

[Paul Walmsley]

sparse identifies several missing prototypes caused by missing
preprocessor include directives:

arch/riscv/kernel/cpufeature.c:16:6: warning: symbol 'has_fpu' was not declared. Should it be static?
arch/riscv/kernel/process.c:26:6: warning: symbol 'arch_cpu_idle' was not declared. Should it be static?
arch/riscv/kernel/process.c:93:5: warning: symbol 'arch_dup_task_struct' was not declared. Should it be static?
arch/riscv/kernel/reset.c:15:6: warning: symbol 'pm_power_off' was not declared. Should it be static?
arch/riscv/kernel/syscall_table.c:15:6: warning: symbol 'sys_call_table' was not declared. Should it be static?
arch/riscv/kernel/time.c:14:13: warning: symbol 'time_init' was not declared. Should it be static?
arch/riscv/kernel/vdso.c:54:5: warning: symbol 'arch_setup_additional_pages' was not declared. Should it be static?
arch/riscv/kernel/smpboot.c:134:24: warning: symbol 'smp_callin' was not declared. Should it be static?
arch/riscv/kernel/smp.c:64:6: warning: symbol 'arch_match_cpu_phys_id' was not declared. Should it be static?
arch/riscv/kernel/smp.c:70:5: warning: symbol 'setup_profiling_timer' was not declared. Should it be static?
arch/riscv/kernel/module-sections.c:89:5: warning: symbol 'module_frob_arch_sections' was not declared. Should it be static?
arch/riscv/mm/context.c:42:6: warning: symbol 'switch_mm' was not declared. Should it be static?

Fix by including the appropriate header files in the appropriate
source files.

This patch should have no functional impact.

Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
---
 arch/riscv/include/asm/irq.h        | 3 +++
 arch/riscv/include/asm/switch_to.h  | 1 +
 arch/riscv/kernel/cpufeature.c      | 1 +
 arch/riscv/kernel/module-sections.c | 1 +
 arch/riscv/kernel/process.c         | 2 ++
 arch/riscv/kernel/reset.c           | 1 +
 arch/riscv/kernel/smp.c             | 2 ++
 arch/riscv/kernel/smpboot.c         | 1 +
 arch/riscv/kernel/syscall_table.c   | 1 +
 arch/riscv/kernel/time.c            | 1 +
 arch/riscv/kernel/vdso.c            | 1 +
 arch/riscv/mm/context.c             | 1 +
 12 files changed, 16 insertions(+)

diff --git a/arch/riscv/include/asm/irq.h b/arch/riscv/include/asm/irq.h
index 589e2d9fb2a6..f0e9df6e6049 100644
--- a/arch/riscv/include/asm/irq.h
+++ b/arch/riscv/include/asm/irq.h
@@ -7,6 +7,9 @@
 #ifndef _ASM_RISCV_IRQ_H
 #define _ASM_RISCV_IRQ_H
 
+#include <linux/interrupt.h>
+#include <linux/linkage.h>
+
 #define NR_IRQS         0
 
 void riscv_timer_interrupt(void);
diff --git a/arch/riscv/include/asm/switch_to.h b/arch/riscv/include/asm/switch_to.h
index f0227bdce0f0..ee4f0ac62c9d 100644
--- a/arch/riscv/include/asm/switch_to.h
+++ b/arch/riscv/include/asm/switch_to.h
@@ -6,6 +6,7 @@
 #ifndef _ASM_RISCV_SWITCH_TO_H
 #define _ASM_RISCV_SWITCH_TO_H
 
+#include <linux/sched/task_stack.h>
 #include <asm/processor.h>
 #include <asm/ptrace.h>
 #include <asm/csr.h>
diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index b1ade9a49347..a5ad00043104 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -10,6 +10,7 @@
 #include <asm/processor.h>
 #include <asm/hwcap.h>
 #include <asm/smp.h>
+#include <asm/switch_to.h>
 
 unsigned long elf_hwcap __read_mostly;
 #ifdef CONFIG_FPU
diff --git a/arch/riscv/kernel/module-sections.c b/arch/riscv/kernel/module-sections.c
index c9ae48333114..e264e59e596e 100644
--- a/arch/riscv/kernel/module-sections.c
+++ b/arch/riscv/kernel/module-sections.c
@@ -8,6 +8,7 @@
 #include <linux/elf.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/moduleloader.h>
 
 unsigned long module_emit_got_entry(struct module *mod, unsigned long val)
 {
diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
index fb3a082362eb..85e3c39bb60b 100644
--- a/arch/riscv/kernel/process.c
+++ b/arch/riscv/kernel/process.c
@@ -7,6 +7,7 @@
  * Copyright (C) 2017 SiFive
  */
 
+#include <linux/cpu.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/sched/task_stack.h>
@@ -19,6 +20,7 @@
 #include <asm/csr.h>
 #include <asm/string.h>
 #include <asm/switch_to.h>
+#include <asm/thread_info.h>
 
 extern asmlinkage void ret_from_fork(void);
 extern asmlinkage void ret_from_kernel_thread(void);
diff --git a/arch/riscv/kernel/reset.c b/arch/riscv/kernel/reset.c
index d0fe623bfb8f..aa56bb135ec4 100644
--- a/arch/riscv/kernel/reset.c
+++ b/arch/riscv/kernel/reset.c
@@ -4,6 +4,7 @@
  */
 
 #include <linux/reboot.h>
+#include <linux/pm.h>
 #include <asm/sbi.h>
 
 static void default_power_off(void)
diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c
index b18cd6c8e8fb..5c9ec78422c2 100644
--- a/arch/riscv/kernel/smp.c
+++ b/arch/riscv/kernel/smp.c
@@ -8,7 +8,9 @@
  * Copyright (C) 2017 SiFive
  */
 
+#include <linux/cpu.h>
 #include <linux/interrupt.h>
+#include <linux/profile.h>
 #include <linux/smp.h>
 #include <linux/sched.h>
 #include <linux/seq_file.h>
diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index 59fa59e013d4..ec0be2f6a2e8 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -29,6 +29,7 @@
 #include <asm/tlbflush.h>
 #include <asm/sections.h>
 #include <asm/sbi.h>
+#include <asm/smp.h>
 
 #include "head.h"
 
diff --git a/arch/riscv/kernel/syscall_table.c b/arch/riscv/kernel/syscall_table.c
index e5dd52d8f633..f1ead9df96ca 100644
--- a/arch/riscv/kernel/syscall_table.c
+++ b/arch/riscv/kernel/syscall_table.c
@@ -8,6 +8,7 @@
 #include <linux/syscalls.h>
 #include <asm-generic/syscalls.h>
 #include <asm/vdso.h>
+#include <asm/syscall.h>
 
 #undef __SYSCALL
 #define __SYSCALL(nr, call)	[nr] = (call),
diff --git a/arch/riscv/kernel/time.c b/arch/riscv/kernel/time.c
index 9dd1f2e64db1..6a53c02e9c73 100644
--- a/arch/riscv/kernel/time.c
+++ b/arch/riscv/kernel/time.c
@@ -7,6 +7,7 @@
 #include <linux/clocksource.h>
 #include <linux/delay.h>
 #include <asm/sbi.h>
+#include <asm/processor.h>
 
 unsigned long riscv_timebase;
 EXPORT_SYMBOL_GPL(riscv_timebase);
diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c
index e24fccab8185..484d95a70907 100644
--- a/arch/riscv/kernel/vdso.c
+++ b/arch/riscv/kernel/vdso.c
@@ -6,6 +6,7 @@
  * Copyright (C) 2015 Regents of the University of California
  */
 
+#include <linux/elf.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/binfmts.h>
diff --git a/arch/riscv/mm/context.c b/arch/riscv/mm/context.c
index beeb5d7f92ea..ca66d44156b6 100644
--- a/arch/riscv/mm/context.c
+++ b/arch/riscv/mm/context.c
@@ -7,6 +7,7 @@
 #include <linux/mm.h>
 #include <asm/tlbflush.h>
 #include <asm/cacheflush.h>
+#include <asm/mmu_context.h>
 
 /*
  * When necessary, performs a deferred icache flush for the given MM context,
-- 
2.23.0


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Re: [PATCH v3 6/8] riscv: add missing header file includes

[Christoph Hellwig]

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

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[PATCH v3 7/8] riscv: fp: add missing __user pointer annotations

[Paul Walmsley]

The __user annotations were removed from the {save,restore}_fp_state()
function signatures by commit 007f5c358957 ("Refactor FPU code in
signal setup/return procedures"), but should be present, and sparse
warns when they are not applied.  Add them back in.

This change should have no functional impact.

Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
Fixes: 007f5c358957 ("Refactor FPU code in signal setup/return procedures")
Cc: Alan Kao <alankao@andestech.com>
---
 arch/riscv/kernel/signal.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c
index 85c700ad47e9..9437167f463e 100644
--- a/arch/riscv/kernel/signal.c
+++ b/arch/riscv/kernel/signal.c
@@ -28,7 +28,7 @@ struct rt_sigframe {
 
 #ifdef CONFIG_FPU
 static long restore_fp_state(struct pt_regs *regs,
-			     union __riscv_fp_state *sc_fpregs)
+			     union __riscv_fp_state __user *sc_fpregs)
 {
 	long err;
 	struct __riscv_d_ext_state __user *state = &sc_fpregs->d;
@@ -55,7 +55,7 @@ static long restore_fp_state(struct pt_regs *regs,
 }
 
 static long save_fp_state(struct pt_regs *regs,
-			  union __riscv_fp_state *sc_fpregs)
+			  union __riscv_fp_state __user *sc_fpregs)
 {
 	long err;
 	struct __riscv_d_ext_state __user *state = &sc_fpregs->d;
-- 
2.23.0


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Re: [PATCH v3 7/8] riscv: fp: add missing __user pointer annotations

[Christoph Hellwig]

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

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[PATCH v3 8/8] riscv: for C functions called only from assembly, mark with __visible

[Paul Walmsley]

Rather than adding prototypes for C functions called only by assembly
code, mark them as __visible.  This avoids adding prototypes that will
never be used by the callers.  Resolves the following sparse warnings:

arch/riscv/kernel/ptrace.c:151:6: warning: symbol 'do_syscall_trace_enter' was not declared. Should it be static?
arch/riscv/kernel/ptrace.c:175:6: warning: symbol 'do_syscall_trace_exit' was not declared. Should it be static?

Based on a suggestion from Luc Van Oostenryck.

Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
---
 arch/riscv/kernel/ptrace.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/kernel/ptrace.c b/arch/riscv/kernel/ptrace.c
index 63e47c9f85f0..0f84628b9385 100644
--- a/arch/riscv/kernel/ptrace.c
+++ b/arch/riscv/kernel/ptrace.c
@@ -148,7 +148,7 @@ long arch_ptrace(struct task_struct *child, long request,
  * Allows PTRACE_SYSCALL to work.  These are called from entry.S in
  * {handle,ret_from}_syscall.
  */
-void do_syscall_trace_enter(struct pt_regs *regs)
+__visible void do_syscall_trace_enter(struct pt_regs *regs)
 {
 	if (test_thread_flag(TIF_SYSCALL_TRACE))
 		if (tracehook_report_syscall_entry(regs))
@@ -172,7 +172,7 @@ void do_syscall_trace_enter(struct pt_regs *regs)
 	audit_syscall_entry(regs->a7, regs->a0, regs->a1, regs->a2, regs->a3);
 }
 
-void do_syscall_trace_exit(struct pt_regs *regs)
+__visible void do_syscall_trace_exit(struct pt_regs *regs)
 {
 	audit_syscall_exit(regs);
 
-- 
2.23.0


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Re: [PATCH v3 8/8] riscv: for C functions called only from assembly, mark with __visible

[Christoph Hellwig]

On Fri, Oct 18, 2019 at 01:08:41AM -0700, Paul Walmsley wrote:
> Rather than adding prototypes for C functions called only by assembly
> code, mark them as __visible.  This avoids adding prototypes that will
> never be used by the callers.  Resolves the following sparse warnings:
> 
> arch/riscv/kernel/ptrace.c:151:6: warning: symbol 'do_syscall_trace_enter' was not declared. Should it be static?
> arch/riscv/kernel/ptrace.c:175:6: warning: symbol 'do_syscall_trace_exit' was not declared. Should it be static?
> 
> Based on a suggestion from Luc Van Oostenryck.
> 
> Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
> Cc: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

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