linux-kernel - Re: [PATCH v4.16-rc6 (1)] x86/vdso: VDSO should handle clock_gettime(CLOCK_MONOTONIC

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Date:   Mon, 19 Mar 2018 17:48:23 +0000
From:   Jason Vas Dias <jason.vas.dias@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     x86@...nel.org, tglx@...utronix.de, mingo@...nel.org,
        peterz@...radead.org, andi@...stfloor.org
Subject: Re: [PATCH v4.16-rc6 (1)] x86/vdso: VDSO should handle
 clock_gettime(CLOCK_MONOTONIC_RAW) without syscall

Note there is a bug raised by H.J. Liu :
     Bug 199129: Don't build vDSO with $(RETPOLINE_CFLAGS) -DRETPOLINE
            (https://bugzilla.kernel.org/show_bug.cgi?id=199129)

If you agree it is a bug, then use both patches from post :
    '[PATCH v4.16-rc5 (2)] x86/vdso: VDSO should handle \
     clock_gettime(CLOCK_MONOTONIC_RAW) without syscall
    '
else, use the single patch from $subject, which makes the
calls to the statics in vclock_gettime.c' use
   indirect_branch("keep") / function_return("keep") ,
to avoid generation of thunk relocations which would not
occur unless compiled with
   -mindirect-branch=thunk-extern -mindirect-branch-register
.

Thanks & Regards,
Jason