From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Michael Ellerman <mpe@ellerman.id.au>, linuxppc-dev@ozlabs.org
Subject: Re: powerpc/64: Make sys_switch_endian() traceable
Date: Fri, 22 Feb 2019 20:47:37 +1100 (AEDT) [thread overview]
Message-ID: <445RMs4hVcz9sBR@ozlabs.org> (raw)
In-Reply-To: <20190115063736.3679-1-mpe@ellerman.id.au>
On Tue, 2019-01-15 at 06:37:36 UTC, Michael Ellerman wrote:
> We weren't using SYSCALL_DEFINE for sys_switch_endian(), which means
> it wasn't able to be traced by CONFIG_FTRACE_SYSCALLS.
>
> By using the macro we create the right metadata and the syscall is
> visible. eg:
>
> # cd /sys/kernel/debug/tracing
> # echo 1 | tee events/syscalls/sys_*_switch_endian/enable
> # ~/switch_endian_test
> # cat trace
> ...
> switch_endian_t-3604 [009] .... 315.175164: sys_switch_endian()
> switch_endian_t-3604 [009] .... 315.175167: sys_switch_endian -> 0x5555aaaa5555aaaa
> switch_endian_t-3604 [009] .... 315.175169: sys_switch_endian()
> switch_endian_t-3604 [009] .... 315.175169: sys_switch_endian -> 0x5555aaaa5555aaaa
>
> Fixes: 529d235a0e19 ("powerpc: Add a proper syscall for switching endianness")
> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Applied to powerpc next.
https://git.kernel.org/powerpc/c/81dac817786263bb44cd5a200a07eff3
cheers
prev parent reply other threads:[~2019-02-22 10:02 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-15 6:37 [PATCH] powerpc/64: Make sys_switch_endian() traceable Michael Ellerman
2019-02-22 9:47 ` Michael Ellerman [this message]
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