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Message-ID: <20161114134017.GJ1041@n2100.armlinux.org.uk>
Date: Mon, 14 Nov 2016 13:40:17 +0000
From: Russell King - ARM Linux <linux@...linux.org.uk>
To: Rabin Vincent <rabin.vincent@...s.com>
Cc: rostedt@...dmis.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, Rabin Vincent <rabinv@...s.com>
Subject: Re: [PATCH] ARM: ftrace: fix syscall name matching
On Mon, Nov 14, 2016 at 02:03:45PM +0100, Rabin Vincent wrote:
> From: Rabin Vincent <rabinv@...s.com>
>
> ARM has a few system calls (most notably mmap) for which the names of
> the functions which are referenced in the syscall table do not match the
> names of the syscall tracepoints. As a consequence of this, these
> tracepoints are not made available. Implement
> arch_syscall_match_sym_name to fix this and allow tracing even these
> system calls.
>
> Signed-off-by: Rabin Vincent <rabinv@...s.com>
> ---
> arch/arm/include/asm/ftrace.h | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/arch/arm/include/asm/ftrace.h b/arch/arm/include/asm/ftrace.h
> index bfe2a2f..8467909 100644
> --- a/arch/arm/include/asm/ftrace.h
> +++ b/arch/arm/include/asm/ftrace.h
> @@ -54,6 +54,27 @@ static inline void *return_address(unsigned int level)
>
> #define ftrace_return_address(n) return_address(n)
>
> +#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
> +
> +static inline bool arch_syscall_match_sym_name(const char *sym,
> + const char *name)
> +{
> + /* Skip sys_ */
> + sym += 4;
> + name += 4;
Is this really safe? What guarantees that we can wind forward four
bytes here? If it's always safe, it needs a better comment than just
two words.
> +
> + if (!strcmp(sym, "mmap2"))
> + sym = "mmap_pgoff";
> + else if (!strcmp(sym, "statfs64_wrapper"))
> + sym = "statfs64";
> + else if (!strcmp(sym, "fstatfs64_wrapper"))
> + sym = "fstatfs64";
> + else if (!strcmp(sym, "arm_fadvise64_64"))
> + sym = "fadvise64_64";
> +
> + return !strcmp(sym, name);
> +}
> +
> #endif /* ifndef __ASSEMBLY__ */
>
> #endif /* _ASM_ARM_FTRACE */
> --
> 2.1.4
>
--
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