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| author |  Naveen N Rao <naveen@kernel.org>
| 2023-06-19 15:17:24 +0530 |
|---|---|---|
| committer |  Michael Ellerman <mpe@ellerman.id.au>
| 2023-08-22 00:09:05 +1000 |
| commit | f3993a0330e2d11e42c095810c6c33084024df46 (patch) | |
| tree | 26349ad0cb0e140963ed96fda394b6a9e994f21a /arch/powerpc/include | |
| parent | powerpc/ftrace: Use FTRACE_REGS_ADDR to identify the correct ftrace trampoline (diff) | |
| download | linux-f3993a0330e2d11e42c095810c6c33084024df46.tar.gz linux-f3993a0330e2d11e42c095810c6c33084024df46.tar.bz2 linux-f3993a0330e2d11e42c095810c6c33084024df46.zip | |
powerpc/ftrace: Extend ftrace support for large kernels to ppc32
Commit 67361cf8071286 ("powerpc/ftrace: Handle large kernel configs")
added ftrace support for ppc64 kernel images with a text section larger
than 32MB. The approach itself isn't specific to ppc64, so extend the
same to also work on ppc32.
While at it, reduce the space reserved for the stub from 64 bytes to 32
bytes since the different stub variants are all less than 8
instructions.
To reduce use of #ifdef, a stub implementation is provided for
kernel_toc_address() and -SZ_2G is cast to 'long long' to prevent
errors on ppc32.
Signed-off-by: Naveen N Rao <naveen@kernel.org>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/9fa3258cbb9105cf8a0a8135214d44ffbc75fe84.1687166935.git.naveen@kernel.org
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/ftrace.h | 10 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/sections.h | 2 |
2 files changed, 9 insertions, 3 deletions
diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h index 2edc6269b1a3..702aaf2efa96 100644 --- a/arch/powerpc/include/asm/ftrace.h +++ b/arch/powerpc/include/asm/ftrace.h @@ -124,15 +124,19 @@ 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 */ + +#ifdef CONFIG_FUNCTION_TRACER +extern unsigned int ftrace_tramp_text[], ftrace_tramp_init[]; +void ftrace_free_init_tramp(void); +#else +static inline void ftrace_free_init_tramp(void) { } +#endif #endif /* !__ASSEMBLY__ */ #endif /* _ASM_POWERPC_FTRACE */ diff --git a/arch/powerpc/include/asm/sections.h b/arch/powerpc/include/asm/sections.h index 4e1f548c8d37..ea26665f82cf 100644 --- a/arch/powerpc/include/asm/sections.h +++ b/arch/powerpc/include/asm/sections.h @@ -74,6 +74,8 @@ static inline int overlaps_kernel_text(unsigned long start, unsigned long end) (unsigned long)_stext < end; } +#else +static inline unsigned long kernel_toc_addr(void) { BUILD_BUG(); return -1UL; } #endif #endif /* __KERNEL__ */ |