On Fri, 26 Jul 2019 12:27:10 +0100,
Anders Roxell <anders.roxell@xxxxxxxxxx> 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.
Thanks,
M.
>
> Fixes: d93512ef0f0e ("Makefile: Globally enable fall-through warning")
> Signed-off-by: Anders Roxell <anders.roxell@xxxxxxxxxx>
> ---
> 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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