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Re: [Qemu-devel] [PATCH] Fix leul_to_cpu on big endian hosts
From: |
Aurelien Jarno |
Subject: |
Re: [Qemu-devel] [PATCH] Fix leul_to_cpu on big endian hosts |
Date: |
Mon, 31 May 2010 20:58:45 +0200 |
User-agent: |
Mutt/1.5.20 (2009-06-14) |
On Mon, May 31, 2010 at 08:44:55PM +0200, Alexander Graf wrote:
> Aurelien Jarno wrote:
> > On Tue, May 11, 2010 at 05:38:17PM +0200, Alexander Graf wrote:
> >
> >> Commit 213acd2e introduced leul_to_cpu with a special code path for big
> >> endian
> >> hosts. Unfortunately that code used preprocessor magic that didn't work.
> >>
> >> This patch replaces the explicit ##s by glue() which is proven to work
> >> reliably,
> >> enabling me to compile qemu on ppc again.
> >>
> >> Signed-off-by: Alexander Graf <address@hidden>
> >> ---
> >> bswap.h | 2 +-
> >> 1 files changed, 1 insertions(+), 1 deletions(-)
> >>
> >> diff --git a/bswap.h b/bswap.h
> >> index 956f3fa..20caae6 100644
> >> --- a/bswap.h
> >> +++ b/bswap.h
> >> @@ -205,7 +205,7 @@ static inline void cpu_to_be32wu(uint32_t *p, uint32_t
> >> v)
> >>
> >> #ifdef HOST_WORDS_BIGENDIAN
> >> #define cpu_to_32wu cpu_to_be32wu
> >> -#define leul_to_cpu(v) le ## HOST_LONG_BITS ## _to_cpu(v)
> >> +#define leul_to_cpu(v) glue(glue(le,HOST_LONG_BITS),_to_cpu)(v)
> >> #else
> >> #define cpu_to_32wu cpu_to_le32wu
> >> #define leul_to_cpu(v) (v)
> >>
> >
> > While the patch looks correct, I am not able to reproduce the issue. Do
> > you have more details about it?
> >
>
> When building on a KVM capable PPC host (or S390 for that matter), I get
> the following:
>
> cc1: warnings being treated as errors
> /home/agraf/release/qemu/kvm-all.c: In function
> ‘kvm_get_dirty_pages_log_range’:
> /home/agraf/release/qemu/kvm-all.c:305: error: implicit declaration of
> function ‘leHOST_LONG_BITS_to_cpu’
> make[1]: *** [kvm-all.o] Error 1
> make[1]: *** Waiting for unfinished jobs....
> make: *** [subdir-ppc64-softmmu] Error 2
>
Ok, that make sense now. I have tried to build on a big endian host, but
KVM was not enabled. Strangely this function is also used at other
places, so I was expecting the build to fail.
Applied now.
--
Aurelien Jarno GPG: 1024D/F1BCDB73
address@hidden http://www.aurel32.net