From: Naveen N Rao Date: Mon, 19 Jun 2023 09:47:19 +0000 (+0530) Subject: powerpc/ftrace: Fix dropping weak symbols with older toolchains X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f6834c8c59a8e977a6f6e4f96c5d28dfa5db8430;p=linux.git powerpc/ftrace: Fix dropping weak symbols with older toolchains The minimum level of gcc supported for building the kernel is v5.1. v5.x releases of gcc emitted a three instruction sequence for -mprofile-kernel: mflr r0 std r0, 16(r1) bl _mcount It is only with the v6.x releases that gcc started emitting the two instruction sequence for -mprofile-kernel, omitting the second store instruction. With the older three instruction sequence, the actual ftrace location can be the 5th instruction into a function. Update the allowed offset for ftrace location from 12 to 16 to accommodate the same. Cc: stable@vger.kernel.org Fixes: 7af82ff90a2b06 ("powerpc/ftrace: Ignore weak functions") Signed-off-by: Naveen N Rao Reviewed-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://msgid.link/7b265908a9461e38fc756ef9b569703860a80621.1687166935.git.naveen@kernel.org --- diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h index 91c049d51d0e1..2edc6269b1a35 100644 --- a/arch/powerpc/include/asm/ftrace.h +++ b/arch/powerpc/include/asm/ftrace.h @@ -12,7 +12,7 @@ /* Ignore unused weak functions which will have larger offsets */ #ifdef CONFIG_MPROFILE_KERNEL -#define FTRACE_MCOUNT_MAX_OFFSET 12 +#define FTRACE_MCOUNT_MAX_OFFSET 16 #elif defined(CONFIG_PPC32) #define FTRACE_MCOUNT_MAX_OFFSET 8 #endif