From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: linuxppc-dev@lists.ozlabs.org, stable@vger.kernel.org
Subject: [PATCH v5.15] powerpc/ftrace: Remove ftrace init tramp once kernel init is complete
Date: Mon, 27 Jun 2022 23:09:28 +0530 [thread overview]
Message-ID: <20220627173930.133620-2-naveen.n.rao@linux.vnet.ibm.com> (raw)
In-Reply-To: <20220627173930.133620-1-naveen.n.rao@linux.vnet.ibm.com>
commit 84ade0a6655bee803d176525ef457175cbf4df22 upstream.
Stop using the ftrace trampoline for init section once kernel init is
complete.
Fixes: 67361cf8071286 ("powerpc/ftrace: Handle large kernel configs")
Cc: stable@vger.kernel.org # v4.20+
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220516071422.463738-1-naveen.n.rao@linux.vnet.ibm.com
---
arch/powerpc/include/asm/ftrace.h | 4 +++-
arch/powerpc/kernel/trace/ftrace.c | 15 ++++++++++++---
arch/powerpc/mm/mem.c | 2 ++
3 files changed, 17 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h
index debe8c4f706260..02d32d6422cd8b 100644
--- a/arch/powerpc/include/asm/ftrace.h
+++ b/arch/powerpc/include/asm/ftrace.h
@@ -96,7 +96,7 @@ static inline bool arch_syscall_match_sym_name(const char *sym, const char *name
#endif /* PPC64_ELF_ABI_v1 */
#endif /* CONFIG_FTRACE_SYSCALLS */
-#ifdef CONFIG_PPC64
+#if defined(CONFIG_PPC64) && defined(CONFIG_FUNCTION_TRACER)
#include <asm/paca.h>
static inline void this_cpu_disable_ftrace(void)
@@ -120,11 +120,13 @@ static inline u8 this_cpu_get_ftrace_enabled(void)
return get_paca()->ftrace_enabled;
}
+void ftrace_free_init_tramp(void);
#else /* CONFIG_PPC64 */
static inline void this_cpu_disable_ftrace(void) { }
static inline void this_cpu_enable_ftrace(void) { }
static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { }
static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; }
+static inline void ftrace_free_init_tramp(void) { }
#endif /* CONFIG_PPC64 */
#endif /* !__ASSEMBLY__ */
diff --git a/arch/powerpc/kernel/trace/ftrace.c b/arch/powerpc/kernel/trace/ftrace.c
index d89c5df4f20620..660040c2d7b543 100644
--- a/arch/powerpc/kernel/trace/ftrace.c
+++ b/arch/powerpc/kernel/trace/ftrace.c
@@ -336,9 +336,7 @@ static int setup_mcount_compiler_tramp(unsigned long tramp)
/* Is this a known long jump tramp? */
for (i = 0; i < NUM_FTRACE_TRAMPS; i++)
- if (!ftrace_tramps[i])
- break;
- else if (ftrace_tramps[i] == tramp)
+ if (ftrace_tramps[i] == tramp)
return 0;
/* Is this a known plt tramp? */
@@ -881,6 +879,17 @@ void arch_ftrace_update_code(int command)
extern unsigned int ftrace_tramp_text[], ftrace_tramp_init[];
+void ftrace_free_init_tramp(void)
+{
+ int i;
+
+ for (i = 0; i < NUM_FTRACE_TRAMPS && ftrace_tramps[i]; i++)
+ if (ftrace_tramps[i] == (unsigned long)ftrace_tramp_init) {
+ ftrace_tramps[i] = 0;
+ return;
+ }
+}
+
int __init ftrace_dyn_arch_init(void)
{
int i;
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 05b9c3f31456c6..543a044560e935 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -22,6 +22,7 @@
#include <asm/kasan.h>
#include <asm/svm.h>
#include <asm/mmzone.h>
+#include <asm/ftrace.h>
#include <mm/mmu_decl.h>
@@ -314,6 +315,7 @@ void free_initmem(void)
mark_initmem_nx();
init_mem_is_free = true;
free_initmem_default(POISON_FREE_INITMEM);
+ ftrace_free_init_tramp();
}
/*
base-commit: 18a33c8dabb88b50b860e0177a73933f2c0ddf68
--
2.36.1
next prev parent reply other threads:[~2022-06-27 17:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-27 17:39 [PATCH v5.10] powerpc/ftrace: Remove ftrace init tramp once kernel init is complete Naveen N. Rao
2022-06-27 17:39 ` Naveen N. Rao [this message]
2022-06-27 17:39 ` [PATCH v5.18] " Naveen N. Rao
2022-06-30 11:31 ` Greg KH
2022-06-27 17:39 ` [PATCH v5.4] " Naveen N. Rao
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