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powerpc/ftrace: Remove ftrace init tramp once kernel init is complete

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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
This commit is contained in:
Naveen N. Rao 2022-05-16 12:44:22 +05:30 committed by Michael Ellerman
parent 5fe855169f
commit 84ade0a665
3 changed files with 17 additions and 4 deletions
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4
arch/powerpc/include/asm/ftrace.h
View File

@ -86,7 +86,7 @@ static inline bool arch_syscall_match_sym_name(const char *sym, const char *name
#endif /* CONFIG_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)
@ -110,11 +110,13 @@ 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__ */

15
arch/powerpc/kernel/trace/ftrace.c
View File

@ -257,9 +257,7 @@ 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;
/* New trampoline -- read where this goes */
@ -710,6 +708,17 @@ 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;

2
arch/powerpc/mm/mem.c
View File

@ -22,6 +22,7 @@
#include <asm/kasan.h>
#include <asm/svm.h>
#include <asm/mmzone.h>
#include <asm/ftrace.h>
#include <asm/code-patching.h>
#include <mm/mmu_decl.h>
@ -314,6 +315,7 @@ void free_initmem(void)
mark_initmem_nx();
static_branch_enable(&init_mem_is_free);
free_initmem_default(POISON_FREE_INITMEM);
ftrace_free_init_tramp();
}
/*