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Date: Fri, 26 Jul 2019 16:11:05 +0200
From: Anders Roxell <anders.roxell@...aro.org>
To: Marc Zyngier <marc.zyngier@....com>
Cc: Catalin Marinas <catalin.marinas@....com>, will@...nel.org,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
kvmarm@...ts.cs.columbia.edu,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] arm64: KVM: hyp: debug-sr: Mark expected switch fall-through
On Fri, 26 Jul 2019 at 14:31, Marc Zyngier <marc.zyngier@....com> wrote:
>
> On Fri, 26 Jul 2019 12:27:10 +0100,
> Anders Roxell <anders.roxell@...aro.org> wrote:
> >
> > When fall-through warnings was enabled by default the following warnings
> > was starting to show up:
> >
> > ../arch/arm64/kvm/hyp/debug-sr.c: In function ‘__debug_save_state’:
> > ../arch/arm64/kvm/hyp/debug-sr.c:20:19: warning: this statement may fall
> > through [-Wimplicit-fallthrough=]
> > case 15: ptr[15] = read_debug(reg, 15); \
> > ../arch/arm64/kvm/hyp/debug-sr.c:113:2: note: in expansion of macro ‘save_debug’
> > save_debug(dbg->dbg_bcr, dbgbcr, brps);
> > ^~~~~~~~~~
> > ../arch/arm64/kvm/hyp/debug-sr.c:21:2: note: here
> > case 14: ptr[14] = read_debug(reg, 14); \
> > ^~~~
> > ../arch/arm64/kvm/hyp/debug-sr.c:113:2: note: in expansion of macro ‘save_debug’
> > save_debug(dbg->dbg_bcr, dbgbcr, brps);
> > ^~~~~~~~~~
> > ../arch/arm64/kvm/hyp/debug-sr.c:21:19: warning: this statement may fall
> > through [-Wimplicit-fallthrough=]
> > case 14: ptr[14] = read_debug(reg, 14); \
> > ../arch/arm64/kvm/hyp/debug-sr.c:113:2: note: in expansion of macro ‘save_debug’
> > save_debug(dbg->dbg_bcr, dbgbcr, brps);
> > ^~~~~~~~~~
> > ../arch/arm64/kvm/hyp/debug-sr.c:22:2: note: here
> > case 13: ptr[13] = read_debug(reg, 13); \
> > ^~~~
> > ../arch/arm64/kvm/hyp/debug-sr.c:113:2: note: in expansion of macro ‘save_debug’
> > save_debug(dbg->dbg_bcr, dbgbcr, brps);
> > ^~~~~~~~~~
> >
> > Rework to add a 'break;' where the compiler warned about
> > fall-through.
>
> That's not what this patch does, I'm afraid.
urgh I'm sorry.
Sending a v2 shortly.
>
> Thanks,
>
> M.
>
> >
> > Fixes: d93512ef0f0e ("Makefile: Globally enable fall-through warning")
> > Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
> > ---
> > arch/arm64/kvm/hyp/debug-sr.c | 30 ++++++++++++++++++++++++++++++
> > 1 file changed, 30 insertions(+)
> >
> > diff --git a/arch/arm64/kvm/hyp/debug-sr.c b/arch/arm64/kvm/hyp/debug-sr.c
> > index 26781da3ad3e..0fc9872a1467 100644
> > --- a/arch/arm64/kvm/hyp/debug-sr.c
> > +++ b/arch/arm64/kvm/hyp/debug-sr.c
> > @@ -18,40 +18,70 @@
> > #define save_debug(ptr,reg,nr) \
> > switch (nr) { \
> > case 15: ptr[15] = read_debug(reg, 15); \
> > + /* Fall through */ \
> > case 14: ptr[14] = read_debug(reg, 14); \
> > + /* Fall through */ \
> > case 13: ptr[13] = read_debug(reg, 13); \
> > + /* Fall through */ \
> > case 12: ptr[12] = read_debug(reg, 12); \
> > + /* Fall through */ \
> > case 11: ptr[11] = read_debug(reg, 11); \
> > + /* Fall through */ \
> > case 10: ptr[10] = read_debug(reg, 10); \
> > + /* Fall through */ \
> > case 9: ptr[9] = read_debug(reg, 9); \
> > + /* Fall through */ \
> > case 8: ptr[8] = read_debug(reg, 8); \
> > + /* Fall through */ \
> > case 7: ptr[7] = read_debug(reg, 7); \
> > + /* Fall through */ \
> > case 6: ptr[6] = read_debug(reg, 6); \
> > + /* Fall through */ \
> > case 5: ptr[5] = read_debug(reg, 5); \
> > + /* Fall through */ \
> > case 4: ptr[4] = read_debug(reg, 4); \
> > + /* Fall through */ \
> > case 3: ptr[3] = read_debug(reg, 3); \
> > + /* Fall through */ \
> > case 2: ptr[2] = read_debug(reg, 2); \
> > + /* Fall through */ \
> > case 1: ptr[1] = read_debug(reg, 1); \
> > + /* Fall through */ \
> > default: ptr[0] = read_debug(reg, 0); \
> > }
> >
> > #define restore_debug(ptr,reg,nr) \
> > switch (nr) { \
> > case 15: write_debug(ptr[15], reg, 15); \
> > + /* Fall through */ \
> > case 14: write_debug(ptr[14], reg, 14); \
> > + /* Fall through */ \
> > case 13: write_debug(ptr[13], reg, 13); \
> > + /* Fall through */ \
> > case 12: write_debug(ptr[12], reg, 12); \
> > + /* Fall through */ \
> > case 11: write_debug(ptr[11], reg, 11); \
> > + /* Fall through */ \
> > case 10: write_debug(ptr[10], reg, 10); \
> > + /* Fall through */ \
> > case 9: write_debug(ptr[9], reg, 9); \
> > + /* Fall through */ \
> > case 8: write_debug(ptr[8], reg, 8); \
> > + /* Fall through */ \
> > case 7: write_debug(ptr[7], reg, 7); \
> > + /* Fall through */ \
> > case 6: write_debug(ptr[6], reg, 6); \
> > + /* Fall through */ \
> > case 5: write_debug(ptr[5], reg, 5); \
> > + /* Fall through */ \
> > case 4: write_debug(ptr[4], reg, 4); \
> > + /* Fall through */ \
> > case 3: write_debug(ptr[3], reg, 3); \
> > + /* Fall through */ \
> > case 2: write_debug(ptr[2], reg, 2); \
> > + /* Fall through */ \
> > case 1: write_debug(ptr[1], reg, 1); \
> > + /* Fall through */ \
> > default: write_debug(ptr[0], reg, 0); \
> > }
> >
> > --
> > 2.20.1
> >
>
> --
> Jazz is not dead, it just smells funny.
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