* [PATCH 0/3] ARM: Implement MODULE_PLT support in FTRACE
@ 2018-02-23 16:58 Alexander Sverdlin
2018-02-23 16:58 ` [PATCH 1/3] ftrace: Add module to ftrace_make_call() parameters Alexander Sverdlin
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Alexander Sverdlin @ 2018-02-23 16:58 UTC (permalink / raw)
To: linux-arm-kernel
FTRACE's function tracer currently doesn't always work on ARM with
MODULE_PLT option enabled. If the module is loaded too far, FTRACE's
code modifier cannot cope with introduced veneers and turns the
function tracer off globally.
ARM64 already has a solution for the problem, refer to the following
patches:
arm64: ftrace: emit ftrace-mod.o contents through code
arm64: module-plts: factor out PLT generation code for ftrace
arm64: ftrace: fix !CONFIG_ARM64_MODULE_PLTS kernels
arm64: ftrace: fix building without CONFIG_MODULES
arm64: ftrace: add support for far branches to dynamic ftrace
arm64: ftrace: don't validate branch via PLT in ftrace_make_nop()
But the presented ARM variant has just a half of the footprint in terms of
the changed LoCs. It also retains the code validation-before-modification
instead of switching it off.
Alexander Sverdlin (3):
ftrace: Add module to ftrace_make_call() parameters
ARM: PLT: Move struct plt_entries definition to header
ftrace: Add MODULE_PLTS support
arch/arm/include/asm/module.h | 10 ++++++
arch/arm/kernel/ftrace.c | 73 ++++++++++++++++++++++++++++++++------
arch/arm/kernel/module-plts.c | 58 +++++++++++++++++++-----------
arch/arm64/kernel/ftrace.c | 3 +-
arch/blackfin/kernel/ftrace.c | 3 +-
arch/ia64/kernel/ftrace.c | 3 +-
arch/metag/kernel/ftrace.c | 3 +-
arch/microblaze/kernel/ftrace.c | 3 +-
arch/mips/kernel/ftrace.c | 3 +-
arch/powerpc/kernel/trace/ftrace.c | 3 +-
arch/s390/kernel/ftrace.c | 3 +-
arch/sh/kernel/ftrace.c | 3 +-
arch/sparc/kernel/ftrace.c | 3 +-
arch/tile/kernel/ftrace.c | 3 +-
arch/x86/kernel/ftrace.c | 3 +-
include/linux/ftrace.h | 4 ++-
kernel/trace/ftrace.c | 6 ++--
17 files changed, 140 insertions(+), 47 deletions(-)
--
2.4.6
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH 1/3] ftrace: Add module to ftrace_make_call() parameters
2018-02-23 16:58 [PATCH 0/3] ARM: Implement MODULE_PLT support in FTRACE Alexander Sverdlin
@ 2018-02-23 16:58 ` Alexander Sverdlin
2018-02-25 11:53 ` kbuild test robot
2018-02-25 14:57 ` kbuild test robot
2018-02-23 16:58 ` [PATCH 2/3] ARM: PLT: Move struct plt_entries definition to header Alexander Sverdlin
2018-02-23 16:58 ` [PATCH 3/3] ftrace: Add MODULE_PLTS support Alexander Sverdlin
2 siblings, 2 replies; 6+ messages in thread
From: Alexander Sverdlin @ 2018-02-23 16:58 UTC (permalink / raw)
To: linux-arm-kernel
ARM support for modules' PLTs will require a module pointer in
ftrace_make_call() exactly as ftrace_make_nop() has it. Change the function
signature without functional change for now.
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
---
arch/arm/kernel/ftrace.c | 3 ++-
arch/arm64/kernel/ftrace.c | 3 ++-
arch/blackfin/kernel/ftrace.c | 3 ++-
arch/ia64/kernel/ftrace.c | 3 ++-
arch/metag/kernel/ftrace.c | 3 ++-
arch/microblaze/kernel/ftrace.c | 3 ++-
arch/mips/kernel/ftrace.c | 3 ++-
arch/powerpc/kernel/trace/ftrace.c | 3 ++-
arch/s390/kernel/ftrace.c | 3 ++-
arch/sh/kernel/ftrace.c | 3 ++-
arch/sparc/kernel/ftrace.c | 3 ++-
arch/tile/kernel/ftrace.c | 3 ++-
arch/x86/kernel/ftrace.c | 3 ++-
include/linux/ftrace.h | 4 +++-
kernel/trace/ftrace.c | 6 +++---
15 files changed, 32 insertions(+), 17 deletions(-)
diff --git a/arch/arm/kernel/ftrace.c b/arch/arm/kernel/ftrace.c
index 5617932..be20adc 100644
--- a/arch/arm/kernel/ftrace.c
+++ b/arch/arm/kernel/ftrace.c
@@ -162,7 +162,8 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
return ret;
}
-int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+int ftrace_make_call(struct module *mod, struct dyn_ftrace *rec,
+ unsigned long addr)
{
unsigned long new, old;
unsigned long ip = rec->ip;
diff --git a/arch/arm64/kernel/ftrace.c b/arch/arm64/kernel/ftrace.c
index 50986e3..e3a95d3 100644
--- a/arch/arm64/kernel/ftrace.c
+++ b/arch/arm64/kernel/ftrace.c
@@ -68,7 +68,8 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
/*
* Turn on the call to ftrace_caller() in instrumented function
*/
-int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+int ftrace_make_call(struct module *mod, struct dyn_ftrace *rec,
+ unsigned long addr)
{
unsigned long pc = rec->ip;
u32 old, new;
diff --git a/arch/blackfin/kernel/ftrace.c b/arch/blackfin/kernel/ftrace.c
index 8dad758..61ffc99 100644
--- a/arch/blackfin/kernel/ftrace.c
+++ b/arch/blackfin/kernel/ftrace.c
@@ -45,7 +45,8 @@ int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
return ftrace_modify_code(rec->ip, mnop, sizeof(mnop));
}
-int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+int ftrace_make_call(struct module *mod, struct dyn_ftrace *rec,
+ unsigned long addr)
{
/* Restore the mcount call site */
unsigned char call[8];
diff --git a/arch/ia64/kernel/ftrace.c b/arch/ia64/kernel/ftrace.c
index cee411e..658a011 100644
--- a/arch/ia64/kernel/ftrace.c
+++ b/arch/ia64/kernel/ftrace.c
@@ -169,7 +169,8 @@ int ftrace_make_nop(struct module *mod,
return ftrace_modify_code(rec->ip, NULL, new, 0);
}
-int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+int ftrace_make_call(struct module *mod, struct dyn_ftrace *rec,
+ unsigned long addr)
{
unsigned long ip = rec->ip;
unsigned char *old, *new;
diff --git a/arch/metag/kernel/ftrace.c b/arch/metag/kernel/ftrace.c
index f7b23d3..635652a 100644
--- a/arch/metag/kernel/ftrace.c
+++ b/arch/metag/kernel/ftrace.c
@@ -104,7 +104,8 @@ int ftrace_make_nop(struct module *mod,
return ftrace_modify_code(ip, old, new);
}
-int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+int ftrace_make_call(struct module *mod, struct dyn_ftrace *rec,
+ unsigned long addr)
{
unsigned char *new, *old;
unsigned long ip = rec->ip;
diff --git a/arch/microblaze/kernel/ftrace.c b/arch/microblaze/kernel/ftrace.c
index d57563c..01b314a 100644
--- a/arch/microblaze/kernel/ftrace.c
+++ b/arch/microblaze/kernel/ftrace.c
@@ -161,7 +161,8 @@ int ftrace_make_nop(struct module *mod,
}
/* I believe that first is called ftrace_make_nop before this function */
-int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+int ftrace_make_call(struct module *mod, struct dyn_ftrace *rec,
+ unsigned long addr)
{
int ret;
pr_debug("%s: addr:0x%x, rec->ip: 0x%x, imm:0x%x\n",
diff --git a/arch/mips/kernel/ftrace.c b/arch/mips/kernel/ftrace.c
index 7f3dfdb..9dcec19 100644
--- a/arch/mips/kernel/ftrace.c
+++ b/arch/mips/kernel/ftrace.c
@@ -200,7 +200,8 @@ int ftrace_make_nop(struct module *mod,
#endif
}
-int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+int ftrace_make_call(struct module *mod, struct dyn_ftrace *rec,
+ unsigned long addr)
{
unsigned int new;
unsigned long ip = rec->ip;
diff --git a/arch/powerpc/kernel/trace/ftrace.c b/arch/powerpc/kernel/trace/ftrace.c
index 4741fe1..b198433 100644
--- a/arch/powerpc/kernel/trace/ftrace.c
+++ b/arch/powerpc/kernel/trace/ftrace.c
@@ -437,7 +437,8 @@ __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
#endif /* CONFIG_PPC64 */
#endif /* CONFIG_MODULES */
-int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+int ftrace_make_call(struct module *mod, struct dyn_ftrace *rec,
+ unsigned long addr)
{
unsigned long ip = rec->ip;
unsigned int old, new;
diff --git a/arch/s390/kernel/ftrace.c b/arch/s390/kernel/ftrace.c
index dc76d81..1691d53 100644
--- a/arch/s390/kernel/ftrace.c
+++ b/arch/s390/kernel/ftrace.c
@@ -136,7 +136,8 @@ int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
return 0;
}
-int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+int ftrace_make_call(struct module *mod, struct dyn_ftrace *rec,
+ unsigned long addr)
{
struct ftrace_insn orig, new, old;
diff --git a/arch/sh/kernel/ftrace.c b/arch/sh/kernel/ftrace.c
index 96dd9f7..2d3cacd 100644
--- a/arch/sh/kernel/ftrace.c
+++ b/arch/sh/kernel/ftrace.c
@@ -242,7 +242,8 @@ int ftrace_make_nop(struct module *mod,
return ftrace_modify_code(rec->ip, old, new);
}
-int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+int ftrace_make_call(struct module *mod, struct dyn_ftrace *rec,
+ unsigned long addr)
{
unsigned char *new, *old;
unsigned long ip = rec->ip;
diff --git a/arch/sparc/kernel/ftrace.c b/arch/sparc/kernel/ftrace.c
index 915dda4..36117b5 100644
--- a/arch/sparc/kernel/ftrace.c
+++ b/arch/sparc/kernel/ftrace.c
@@ -63,7 +63,8 @@ int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec, unsigned long ad
return ftrace_modify_code(ip, old, new);
}
-int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+int ftrace_make_call(struct module *mod, struct dyn_ftrace *rec,
+ unsigned long addr)
{
unsigned long ip = rec->ip;
u32 old, new;
diff --git a/arch/tile/kernel/ftrace.c b/arch/tile/kernel/ftrace.c
index b827a41..749e50f 100644
--- a/arch/tile/kernel/ftrace.c
+++ b/arch/tile/kernel/ftrace.c
@@ -136,7 +136,8 @@ int ftrace_update_ftrace_func(ftrace_func_t func)
return ret;
}
-int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+int ftrace_make_call(struct module *mod, struct dyn_ftrace *rec,
+ unsigned long addr)
{
unsigned long new, old;
unsigned long ip = rec->ip;
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 01ebcb6..389f15c 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -162,7 +162,8 @@ int ftrace_make_nop(struct module *mod,
return -EINVAL;
}
-int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+int ftrace_make_call(struct module *mod, struct dyn_ftrace *rec,
+ unsigned long addr)
{
unsigned const char *new, *old;
unsigned long ip = rec->ip;
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 9c3c9a3..1e8c421 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -536,6 +536,7 @@ extern int ftrace_make_nop(struct module *mod,
/**
* ftrace_make_call - convert a nop call site into a call to addr
+ * @mod: module structure if called by module load initialization
* @rec: the mcount call site record
* @addr: the address that the call site should call
*
@@ -554,7 +555,8 @@ extern int ftrace_make_nop(struct module *mod,
* -EPERM on error writing to the location
* Any other value will be considered a failure.
*/
-extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
+extern int ftrace_make_call(struct module *mod, struct dyn_ftrace *rec,
+ unsigned long addr);
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
/**
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index eac9ce2..d32f2f5 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2421,7 +2421,7 @@ unsigned long ftrace_get_addr_curr(struct dyn_ftrace *rec)
}
static int
-__ftrace_replace_code(struct dyn_ftrace *rec, int enable)
+__ftrace_replace_code(struct module *mod, struct dyn_ftrace *rec, int enable)
{
unsigned long ftrace_old_addr;
unsigned long ftrace_addr;
@@ -2442,7 +2442,7 @@ __ftrace_replace_code(struct dyn_ftrace *rec, int enable)
case FTRACE_UPDATE_MAKE_CALL:
ftrace_bug_type = FTRACE_BUG_CALL;
- return ftrace_make_call(rec, ftrace_addr);
+ return ftrace_make_call(mod, rec, ftrace_addr);
case FTRACE_UPDATE_MAKE_NOP:
ftrace_bug_type = FTRACE_BUG_NOP;
@@ -2470,7 +2470,7 @@ void __weak ftrace_replace_code(int enable)
if (rec->flags & FTRACE_FL_DISABLED)
continue;
- failed = __ftrace_replace_code(rec, enable);
+ failed = __ftrace_replace_code(NULL, rec, enable);
if (failed) {
ftrace_bug(failed, rec);
/* Stop processing */
--
2.4.6
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH 2/3] ARM: PLT: Move struct plt_entries definition to header
2018-02-23 16:58 [PATCH 0/3] ARM: Implement MODULE_PLT support in FTRACE Alexander Sverdlin
2018-02-23 16:58 ` [PATCH 1/3] ftrace: Add module to ftrace_make_call() parameters Alexander Sverdlin
@ 2018-02-23 16:58 ` Alexander Sverdlin
2018-02-23 16:58 ` [PATCH 3/3] ftrace: Add MODULE_PLTS support Alexander Sverdlin
2 siblings, 0 replies; 6+ messages in thread
From: Alexander Sverdlin @ 2018-02-23 16:58 UTC (permalink / raw)
To: linux-arm-kernel
No functional change, later it will be re-used in several files.
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
---
arch/arm/include/asm/module.h | 9 +++++++++
arch/arm/kernel/module-plts.c | 9 ---------
2 files changed, 9 insertions(+), 9 deletions(-)
diff --git a/arch/arm/include/asm/module.h b/arch/arm/include/asm/module.h
index 89ad059..6996405 100644
--- a/arch/arm/include/asm/module.h
+++ b/arch/arm/include/asm/module.h
@@ -19,6 +19,15 @@ enum {
};
#endif
+#define PLT_ENT_STRIDE L1_CACHE_BYTES
+#define PLT_ENT_COUNT (PLT_ENT_STRIDE / sizeof(u32))
+#define PLT_ENT_SIZE (sizeof(struct plt_entries) / PLT_ENT_COUNT)
+
+struct plt_entries {
+ u32 ldr[PLT_ENT_COUNT];
+ u32 lit[PLT_ENT_COUNT];
+};
+
struct mod_plt_sec {
struct elf32_shdr *plt;
int plt_count;
diff --git a/arch/arm/kernel/module-plts.c b/arch/arm/kernel/module-plts.c
index 3d0c2e4..f272711 100644
--- a/arch/arm/kernel/module-plts.c
+++ b/arch/arm/kernel/module-plts.c
@@ -14,10 +14,6 @@
#include <asm/cache.h>
#include <asm/opcodes.h>
-#define PLT_ENT_STRIDE L1_CACHE_BYTES
-#define PLT_ENT_COUNT (PLT_ENT_STRIDE / sizeof(u32))
-#define PLT_ENT_SIZE (sizeof(struct plt_entries) / PLT_ENT_COUNT)
-
#ifdef CONFIG_THUMB2_KERNEL
#define PLT_ENT_LDR __opcode_to_mem_thumb32(0xf8dff000 | \
(PLT_ENT_STRIDE - 4))
@@ -26,11 +22,6 @@
(PLT_ENT_STRIDE - 8))
#endif
-struct plt_entries {
- u32 ldr[PLT_ENT_COUNT];
- u32 lit[PLT_ENT_COUNT];
-};
-
static bool in_init(const struct module *mod, unsigned long loc)
{
return loc - (u32)mod->init_layout.base < mod->init_layout.size;
--
2.4.6
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH 3/3] ftrace: Add MODULE_PLTS support
2018-02-23 16:58 [PATCH 0/3] ARM: Implement MODULE_PLT support in FTRACE Alexander Sverdlin
2018-02-23 16:58 ` [PATCH 1/3] ftrace: Add module to ftrace_make_call() parameters Alexander Sverdlin
2018-02-23 16:58 ` [PATCH 2/3] ARM: PLT: Move struct plt_entries definition to header Alexander Sverdlin
@ 2018-02-23 16:58 ` Alexander Sverdlin
2 siblings, 0 replies; 6+ messages in thread
From: Alexander Sverdlin @ 2018-02-23 16:58 UTC (permalink / raw)
To: linux-arm-kernel
Teach ftrace_make_call() and ftrace_make_nop() about PLTs.
Teach PLT code about FTRACE and all its callbacks.
Otherwise the following might happen:
------------[ cut here ]------------
WARNING: CPU: 14 PID: 2265 at .../arch/arm/kernel/insn.c:14 __arm_gen_branch+0x83/0x8c()
...
Hardware name: LSI Axxia AXM55XX
[<c0314a49>] (unwind_backtrace) from [<c03115e9>] (show_stack+0x11/0x14)
[<c03115e9>] (show_stack) from [<c0519f51>] (dump_stack+0x81/0xa8)
[<c0519f51>] (dump_stack) from [<c032185d>] (warn_slowpath_common+0x69/0x90)
[<c032185d>] (warn_slowpath_common) from [<c03218f3>] (warn_slowpath_null+0x17/0x1c)
[<c03218f3>] (warn_slowpath_null) from [<c03143cf>] (__arm_gen_branch+0x83/0x8c)
[<c03143cf>] (__arm_gen_branch) from [<c0314337>] (ftrace_make_nop+0xf/0x24)
[<c0314337>] (ftrace_make_nop) from [<c038ebcb>] (ftrace_process_locs+0x27b/0x3e8)
[<c038ebcb>] (ftrace_process_locs) from [<c0378d79>] (load_module+0x11e9/0x1a44)
[<c0378d79>] (load_module) from [<c037974d>] (SyS_finit_module+0x59/0x84)
[<c037974d>] (SyS_finit_module) from [<c030e981>] (ret_fast_syscall+0x1/0x18)
---[ end trace e1b64ced7a89adcc ]---
------------[ cut here ]------------
WARNING: CPU: 14 PID: 2265 at .../kernel/trace/ftrace.c:1979 ftrace_bug+0x1b1/0x234()
...
Hardware name: LSI Axxia AXM55XX
[<c0314a49>] (unwind_backtrace) from [<c03115e9>] (show_stack+0x11/0x14)
[<c03115e9>] (show_stack) from [<c0519f51>] (dump_stack+0x81/0xa8)
[<c0519f51>] (dump_stack) from [<c032185d>] (warn_slowpath_common+0x69/0x90)
[<c032185d>] (warn_slowpath_common) from [<c03218f3>] (warn_slowpath_null+0x17/0x1c)
[<c03218f3>] (warn_slowpath_null) from [<c038e87d>] (ftrace_bug+0x1b1/0x234)
[<c038e87d>] (ftrace_bug) from [<c038ebd5>] (ftrace_process_locs+0x285/0x3e8)
[<c038ebd5>] (ftrace_process_locs) from [<c0378d79>] (load_module+0x11e9/0x1a44)
[<c0378d79>] (load_module) from [<c037974d>] (SyS_finit_module+0x59/0x84)
[<c037974d>] (SyS_finit_module) from [<c030e981>] (ret_fast_syscall+0x1/0x18)
---[ end trace e1b64ced7a89adcd ]---
ftrace failed to modify [<e9ef7006>] 0xe9ef7006
actual: 02:f0:3b:fa
ftrace record flags: 0
(0) expected tramp: c0314265
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
---
arch/arm/include/asm/module.h | 1 +
arch/arm/kernel/ftrace.c | 70 ++++++++++++++++++++++++++++++++++++-------
arch/arm/kernel/module-plts.c | 53 ++++++++++++++++++++++++--------
3 files changed, 101 insertions(+), 23 deletions(-)
diff --git a/arch/arm/include/asm/module.h b/arch/arm/include/asm/module.h
index 6996405..e3d7a51 100644
--- a/arch/arm/include/asm/module.h
+++ b/arch/arm/include/asm/module.h
@@ -30,6 +30,7 @@ struct plt_entries {
struct mod_plt_sec {
struct elf32_shdr *plt;
+ struct plt_entries *plt_ent;
int plt_count;
};
diff --git a/arch/arm/kernel/ftrace.c b/arch/arm/kernel/ftrace.c
index be20adc..0a0da25 100644
--- a/arch/arm/kernel/ftrace.c
+++ b/arch/arm/kernel/ftrace.c
@@ -98,6 +98,19 @@ int ftrace_arch_code_modify_post_process(void)
static unsigned long ftrace_call_replace(unsigned long pc, unsigned long addr)
{
+ s32 offset = addr - pc;
+ s32 blim = 0xfe000008;
+ s32 flim = 0x02000004;
+
+ if (IS_ENABLED(CONFIG_THUMB2_KERNEL)) {
+ blim = 0xff000004;
+ flim = 0x01000002;
+ }
+
+ if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS) &&
+ (offset < blim || offset > flim))
+ return 0;
+
return arm_gen_branch_link(pc, addr);
}
@@ -167,10 +180,27 @@ int ftrace_make_call(struct module *mod, struct dyn_ftrace *rec,
{
unsigned long new, old;
unsigned long ip = rec->ip;
+ unsigned long aaddr = adjust_address(rec, addr);
old = ftrace_nop_replace(rec);
- new = ftrace_call_replace(ip, adjust_address(rec, addr));
+ new = ftrace_call_replace(ip, aaddr);
+
+#ifdef CONFIG_ARM_MODULE_PLTS
+ if (!new) {
+ /*
+ * mod is only supplied during module loading, later we have to
+ * search for it
+ */
+ if (!mod)
+ mod = __module_address(ip);
+
+ if (mod) {
+ aaddr = get_module_plt(mod, ip, aaddr);
+ new = ftrace_call_replace(ip, aaddr);
+ }
+ }
+#endif
return ftrace_modify_code(rec->ip, old, new, true);
}
@@ -200,20 +230,40 @@ int ftrace_make_nop(struct module *mod,
unsigned long new;
int ret;
- old = ftrace_call_replace(ip, adjust_address(rec, addr));
- new = ftrace_nop_replace(rec);
- ret = ftrace_modify_code(ip, old, new, true);
-
-#ifdef CONFIG_OLD_MCOUNT
- if (ret == -EINVAL && addr == MCOUNT_ADDR) {
- rec->arch.old_mcount = true;
+ for (;;) {
+ unsigned long aaddr = adjust_address(rec, addr);
+
+ old = ftrace_call_replace(ip, aaddr);
+
+#ifdef CONFIG_ARM_MODULE_PLTS
+ if (!old) {
+ /*
+ * mod is only supplied during module loading, later we
+ * have to search for it
+ */
+ if (!mod)
+ mod = __module_address(ip);
+
+ if (mod) {
+ aaddr = get_module_plt(mod, ip, aaddr);
+ old = ftrace_call_replace(ip, aaddr);
+ }
+ }
+#endif
- old = ftrace_call_replace(ip, adjust_address(rec, addr));
new = ftrace_nop_replace(rec);
ret = ftrace_modify_code(ip, old, new, true);
- }
+
+#ifdef CONFIG_OLD_MCOUNT
+ if (ret == -EINVAL && !rec->arch.old_mcount) {
+ rec->arch.old_mcount = true;
+ continue;
+ }
#endif
+ break;
+ }
+
return ret;
}
diff --git a/arch/arm/kernel/module-plts.c b/arch/arm/kernel/module-plts.c
index f272711..a216256 100644
--- a/arch/arm/kernel/module-plts.c
+++ b/arch/arm/kernel/module-plts.c
@@ -7,6 +7,7 @@
*/
#include <linux/elf.h>
+#include <linux/ftrace.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sort.h>
@@ -22,6 +23,15 @@
(PLT_ENT_STRIDE - 8))
#endif
+static u32 fixed_plts[] = {
+ FTRACE_ADDR,
+ MCOUNT_ADDR,
+#ifdef CONFIG_OLD_MCOUNT
+ (unsigned long)ftrace_caller_old,
+ (unsigned long)mcount,
+#endif
+};
+
static bool in_init(const struct module *mod, unsigned long loc)
{
return loc - (u32)mod->init_layout.base < mod->init_layout.size;
@@ -31,26 +41,43 @@ u32 get_module_plt(struct module *mod, unsigned long loc, Elf32_Addr val)
{
struct mod_plt_sec *pltsec = !in_init(mod, loc) ? &mod->arch.core :
&mod->arch.init;
+ int idx;
+ struct plt_entries *plt;
+
+ /* Pre-allocate entries in the first plt */
+ if (!pltsec->plt_count) {
+ plt = (struct plt_entries *)pltsec->plt->sh_addr;
+ for (idx = 0; idx < ARRAY_SIZE(plt->ldr); ++idx)
+ plt->ldr[idx] = PLT_ENT_LDR;
+ memcpy(plt->lit, fixed_plts, sizeof(fixed_plts));
+ pltsec->plt_count = ARRAY_SIZE(fixed_plts);
+ /*
+ * cache the address,
+ * ELF header is available only during module load
+ */
+ pltsec->plt_ent = plt;
+ }
+ plt = pltsec->plt_ent;
- struct plt_entries *plt = (struct plt_entries *)pltsec->plt->sh_addr;
- int idx = 0;
+ idx = ARRAY_SIZE(fixed_plts);
+ while (idx)
+ if (plt->lit[--idx] == val)
+ return (u32)&plt->ldr[idx];
/*
* Look for an existing entry pointing to 'val'. Given that the
* relocations are sorted, this will be the last entry we allocated.
* (if one exists).
*/
- if (pltsec->plt_count > 0) {
- plt += (pltsec->plt_count - 1) / PLT_ENT_COUNT;
- idx = (pltsec->plt_count - 1) % PLT_ENT_COUNT;
+ plt += (pltsec->plt_count - 1) / PLT_ENT_COUNT;
+ idx = (pltsec->plt_count - 1) % PLT_ENT_COUNT;
- if (plt->lit[idx] == val)
- return (u32)&plt->ldr[idx];
+ if (plt->lit[idx] == val)
+ return (u32)&plt->ldr[idx];
- idx = (idx + 1) % PLT_ENT_COUNT;
- if (!idx)
- plt++;
- }
+ idx = (idx + 1) % PLT_ENT_COUNT;
+ if (!idx)
+ plt++;
pltsec->plt_count++;
BUG_ON(pltsec->plt_count * PLT_ENT_SIZE > pltsec->plt->sh_size);
@@ -182,8 +209,8 @@ static unsigned int count_plts(const Elf32_Sym *syms, Elf32_Addr base,
int module_frob_arch_sections(Elf_Ehdr *ehdr, Elf_Shdr *sechdrs,
char *secstrings, struct module *mod)
{
- unsigned long core_plts = 0;
- unsigned long init_plts = 0;
+ unsigned long core_plts = ARRAY_SIZE(fixed_plts);
+ unsigned long init_plts = ARRAY_SIZE(fixed_plts);
Elf32_Shdr *s, *sechdrs_end = sechdrs + ehdr->e_shnum;
Elf32_Sym *syms = NULL;
--
2.4.6
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH 1/3] ftrace: Add module to ftrace_make_call() parameters
2018-02-23 16:58 ` [PATCH 1/3] ftrace: Add module to ftrace_make_call() parameters Alexander Sverdlin
@ 2018-02-25 11:53 ` kbuild test robot
2018-02-25 14:57 ` kbuild test robot
1 sibling, 0 replies; 6+ messages in thread
From: kbuild test robot @ 2018-02-25 11:53 UTC (permalink / raw)
To: linux-arm-kernel
Hi Alexander,
I love your patch! Yet something to improve:
[auto build test ERROR on tip/perf/core]
[also build test ERROR on v4.16-rc2 next-20180223]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Alexander-Sverdlin/ARM-Implement-MODULE_PLT-support-in-FTRACE/20180225-191957
config: x86_64-randconfig-x011-201808 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
All error/warnings (new ones prefixed by >>):
kernel/trace/ftrace.c: In function 'ftrace_module_enable':
>> kernel/trace/ftrace.c:5851:39: error: passing argument 1 of '__ftrace_replace_code' from incompatible pointer type [-Werror=incompatible-pointer-types]
int failed = __ftrace_replace_code(rec, 1);
^~~
kernel/trace/ftrace.c:2424:1: note: expected 'struct module *' but argument is of type 'struct dyn_ftrace *'
__ftrace_replace_code(struct module *mod, struct dyn_ftrace *rec, int enable)
^~~~~~~~~~~~~~~~~~~~~
>> kernel/trace/ftrace.c:5851:44: warning: passing argument 2 of '__ftrace_replace_code' makes pointer from integer without a cast [-Wint-conversion]
int failed = __ftrace_replace_code(rec, 1);
^
kernel/trace/ftrace.c:2424:1: note: expected 'struct dyn_ftrace *' but argument is of type 'int'
__ftrace_replace_code(struct module *mod, struct dyn_ftrace *rec, int enable)
^~~~~~~~~~~~~~~~~~~~~
>> kernel/trace/ftrace.c:5851:17: error: too few arguments to function '__ftrace_replace_code'
int failed = __ftrace_replace_code(rec, 1);
^~~~~~~~~~~~~~~~~~~~~
kernel/trace/ftrace.c:2424:1: note: declared here
__ftrace_replace_code(struct module *mod, struct dyn_ftrace *rec, int enable)
^~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
vim +/__ftrace_replace_code +5851 kernel/trace/ftrace.c
93eb677d Steven Rostedt 2009-04-15 5797
7dcd182b Jessica Yu 2016-02-16 5798 void ftrace_module_enable(struct module *mod)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5799) {
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5800) struct dyn_ftrace *rec;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5801) struct ftrace_page *pg;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5802)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5803) mutex_lock(&ftrace_lock);
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5804)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5805) if (ftrace_disabled)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5806) goto out_unlock;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5807)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5808) /*
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5809) * If the tracing is enabled, go ahead and enable the record.
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5810) *
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5811) * The reason not to enable the record immediatelly is the
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5812) * inherent check of ftrace_make_nop/ftrace_make_call for
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5813) * correct previous instructions. Making first the NOP
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5814) * conversion puts the module to the correct state, thus
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5815) * passing the ftrace_make_call check.
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5816) *
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5817) * We also delay this to after the module code already set the
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5818) * text to read-only, as we now need to set it back to read-write
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5819) * so that we can modify the text.
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5820) */
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5821) if (ftrace_start_up)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5822) ftrace_arch_code_modify_prepare();
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5823)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5824) do_for_each_ftrace_rec(pg, rec) {
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5825) int cnt;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5826) /*
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5827) * do_for_each_ftrace_rec() is a double loop.
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5828) * module text shares the pg. If a record is
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5829) * not part of this module, then skip this pg,
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5830) * which the "break" will do.
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5831) */
3e234289 Steven Rostedt (VMware 2017-03-03 5832) if (!within_module_core(rec->ip, mod) &&
3e234289 Steven Rostedt (VMware 2017-03-03 5833) !within_module_init(rec->ip, mod))
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5834) break;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5835)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5836) cnt = 0;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5837)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5838) /*
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5839) * When adding a module, we need to check if tracers are
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5840) * currently enabled and if they are, and can trace this record,
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5841) * we need to enable the module functions as well as update the
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5842) * reference counts for those function records.
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5843) */
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5844) if (ftrace_start_up)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5845) cnt += referenced_filters(rec);
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5846)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5847) /* This clears FTRACE_FL_DISABLED */
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5848) rec->flags = cnt;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5849)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5850) if (ftrace_start_up && cnt) {
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 @5851) int failed = __ftrace_replace_code(rec, 1);
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5852) if (failed) {
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5853) ftrace_bug(failed, rec);
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5854) goto out_loop;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5855) }
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5856) }
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5857)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5858) } while_for_each_ftrace_rec();
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5859)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5860) out_loop:
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5861) if (ftrace_start_up)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5862) ftrace_arch_code_modify_post_process();
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5863)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5864) out_unlock:
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5865) mutex_unlock(&ftrace_lock);
d7fbf8df Steven Rostedt (VMware 2017-06-26 5866)
d7fbf8df Steven Rostedt (VMware 2017-06-26 5867) process_cached_mods(mod->name);
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5868) }
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5869)
:::::: The code at line 5851 was first introduced by commit
:::::: b7ffffbb46f205e7727a18bcc7a46c3c2b534f7c ftrace: Add infrastructure for delayed enabling of module functions
:::::: TO: Steven Rostedt (Red Hat) <rostedt@goodmis.org>
:::::: CC: Steven Rostedt <rostedt@goodmis.org>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
-------------- next part --------------
A non-text attachment was scrubbed...
Name: .config.gz
Type: application/gzip
Size: 27148 bytes
Desc: not available
URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20180225/10b295a5/attachment-0001.gz>
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH 1/3] ftrace: Add module to ftrace_make_call() parameters
2018-02-23 16:58 ` [PATCH 1/3] ftrace: Add module to ftrace_make_call() parameters Alexander Sverdlin
2018-02-25 11:53 ` kbuild test robot
@ 2018-02-25 14:57 ` kbuild test robot
1 sibling, 0 replies; 6+ messages in thread
From: kbuild test robot @ 2018-02-25 14:57 UTC (permalink / raw)
To: linux-arm-kernel
Hi Alexander,
I love your patch! Perhaps something to improve:
[auto build test WARNING on tip/perf/core]
[also build test WARNING on v4.16-rc2 next-20180223]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Alexander-Sverdlin/ARM-Implement-MODULE_PLT-support-in-FTRACE/20180225-191957
config: i386-randconfig-h1-02251623 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
# save the attached .config to linux build tree
make ARCH=i386
All warnings (new ones prefixed by >>):
kernel/trace/ftrace.c: In function 'ftrace_module_enable':
>> kernel/trace/ftrace.c:5851:39: warning: passing argument 1 of '__ftrace_replace_code' from incompatible pointer type
int failed = __ftrace_replace_code(rec, 1);
^
kernel/trace/ftrace.c:2424:1: note: expected 'struct module *' but argument is of type 'struct dyn_ftrace *'
__ftrace_replace_code(struct module *mod, struct dyn_ftrace *rec, int enable)
^
kernel/trace/ftrace.c:5851:44: warning: passing argument 2 of '__ftrace_replace_code' makes pointer from integer without a cast
int failed = __ftrace_replace_code(rec, 1);
^
kernel/trace/ftrace.c:2424:1: note: expected 'struct dyn_ftrace *' but argument is of type 'int'
__ftrace_replace_code(struct module *mod, struct dyn_ftrace *rec, int enable)
^
kernel/trace/ftrace.c:5851:17: error: too few arguments to function '__ftrace_replace_code'
int failed = __ftrace_replace_code(rec, 1);
^
kernel/trace/ftrace.c:2424:1: note: declared here
__ftrace_replace_code(struct module *mod, struct dyn_ftrace *rec, int enable)
^
vim +/__ftrace_replace_code +5851 kernel/trace/ftrace.c
93eb677d Steven Rostedt 2009-04-15 5797
7dcd182b Jessica Yu 2016-02-16 5798 void ftrace_module_enable(struct module *mod)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5799) {
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5800) struct dyn_ftrace *rec;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5801) struct ftrace_page *pg;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5802)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5803) mutex_lock(&ftrace_lock);
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5804)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5805) if (ftrace_disabled)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5806) goto out_unlock;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5807)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5808) /*
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5809) * If the tracing is enabled, go ahead and enable the record.
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5810) *
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5811) * The reason not to enable the record immediatelly is the
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5812) * inherent check of ftrace_make_nop/ftrace_make_call for
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5813) * correct previous instructions. Making first the NOP
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5814) * conversion puts the module to the correct state, thus
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5815) * passing the ftrace_make_call check.
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5816) *
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5817) * We also delay this to after the module code already set the
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5818) * text to read-only, as we now need to set it back to read-write
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5819) * so that we can modify the text.
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5820) */
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5821) if (ftrace_start_up)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5822) ftrace_arch_code_modify_prepare();
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5823)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5824) do_for_each_ftrace_rec(pg, rec) {
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5825) int cnt;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5826) /*
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5827) * do_for_each_ftrace_rec() is a double loop.
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5828) * module text shares the pg. If a record is
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5829) * not part of this module, then skip this pg,
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5830) * which the "break" will do.
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5831) */
3e234289 Steven Rostedt (VMware 2017-03-03 5832) if (!within_module_core(rec->ip, mod) &&
3e234289 Steven Rostedt (VMware 2017-03-03 5833) !within_module_init(rec->ip, mod))
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5834) break;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5835)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5836) cnt = 0;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5837)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5838) /*
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5839) * When adding a module, we need to check if tracers are
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5840) * currently enabled and if they are, and can trace this record,
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5841) * we need to enable the module functions as well as update the
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5842) * reference counts for those function records.
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5843) */
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5844) if (ftrace_start_up)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5845) cnt += referenced_filters(rec);
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5846)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5847) /* This clears FTRACE_FL_DISABLED */
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5848) rec->flags = cnt;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5849)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5850) if (ftrace_start_up && cnt) {
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 @5851) int failed = __ftrace_replace_code(rec, 1);
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5852) if (failed) {
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5853) ftrace_bug(failed, rec);
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5854) goto out_loop;
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5855) }
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5856) }
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5857)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5858) } while_for_each_ftrace_rec();
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5859)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5860) out_loop:
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5861) if (ftrace_start_up)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5862) ftrace_arch_code_modify_post_process();
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5863)
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5864) out_unlock:
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5865) mutex_unlock(&ftrace_lock);
d7fbf8df Steven Rostedt (VMware 2017-06-26 5866)
d7fbf8df Steven Rostedt (VMware 2017-06-26 5867) process_cached_mods(mod->name);
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5868) }
b7ffffbb Steven Rostedt (Red Hat 2016-01-07 5869)
:::::: The code at line 5851 was first introduced by commit
:::::: b7ffffbb46f205e7727a18bcc7a46c3c2b534f7c ftrace: Add infrastructure for delayed enabling of module functions
:::::: TO: Steven Rostedt (Red Hat) <rostedt@goodmis.org>
:::::: CC: Steven Rostedt <rostedt@goodmis.org>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
-------------- next part --------------
A non-text attachment was scrubbed...
Name: .config.gz
Type: application/gzip
Size: 28472 bytes
Desc: not available
URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20180225/f155c947/attachment-0001.gz>
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2018-02-25 14:57 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-02-23 16:58 [PATCH 0/3] ARM: Implement MODULE_PLT support in FTRACE Alexander Sverdlin
2018-02-23 16:58 ` [PATCH 1/3] ftrace: Add module to ftrace_make_call() parameters Alexander Sverdlin
2018-02-25 11:53 ` kbuild test robot
2018-02-25 14:57 ` kbuild test robot
2018-02-23 16:58 ` [PATCH 2/3] ARM: PLT: Move struct plt_entries definition to header Alexander Sverdlin
2018-02-23 16:58 ` [PATCH 3/3] ftrace: Add MODULE_PLTS support Alexander Sverdlin
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).