Re: [PATCH-for-8.1 4/5] bulk: Do not declare function prototypes using extern keyword

[Daniel P . Berrangé]

On Mon, Mar 20, 2023 at 02:42:18PM +0100, Philippe Mathieu-Daudé wrote:
> By default, C function prototypes declared in headers are visible,
> so there is no need to declare them as 'extern' functions.
> Remove this redundancy in a single bulk commit; do not modify:
> 
>   - meson.build (used to check function availability at runtime)
>   - pc-bios
>   - libdecnumber
>   - *.c
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
>  block/dmg.h                    |  8 +++----
>  bsd-user/bsd-file.h            |  6 ++---
>  crypto/hmacpriv.h              | 13 +++++------
>  hw/xen/xen_pt.h                |  8 +++----
>  include/crypto/secret_common.h | 14 +++++-------
>  include/exec/page-vary.h       |  4 ++--
>  include/hw/misc/aspeed_scu.h   |  2 +-
>  include/hw/nvram/npcm7xx_otp.h |  4 ++--
>  include/hw/qdev-core.h         |  4 ++--
>  include/qemu/crc-ccitt.h       |  4 ++--
>  include/qemu/osdep.h           |  2 +-
>  include/qemu/rcu.h             | 14 ++++++------
>  include/qemu/sys_membarrier.h  |  4 ++--
>  include/qemu/uri.h             |  6 ++---
>  include/sysemu/accel-blocker.h | 14 ++++++------
>  include/sysemu/os-win32.h      |  4 ++--
>  include/user/safe-syscall.h    |  4 ++--
>  target/i386/sev.h              |  6 ++---
>  target/mips/cpu.h              |  4 ++--
>  tcg/tcg-internal.h             |  4 ++--
>  tests/tcg/minilib/minilib.h    |  2 +-
>  include/exec/memory_ldst.h.inc | 42 +++++++++++++++++-----------------
>  roms/seabios                   |  2 +-

Accidental submodule commit.,

>  23 files changed, 84 insertions(+), 91 deletions(-)
> 
> diff --git a/block/dmg.h b/block/dmg.h
> index e488601b62..ed209b5dec 100644
> --- a/block/dmg.h
> +++ b/block/dmg.h
> @@ -51,10 +51,10 @@ typedef struct BDRVDMGState {
>      z_stream zstream;
>  } BDRVDMGState;
>  
> -extern int (*dmg_uncompress_bz2)(char *next_in, unsigned int avail_in,
> -                                 char *next_out, unsigned int avail_out);
> +int (*dmg_uncompress_bz2)(char *next_in, unsigned int avail_in,
> +                          char *next_out, unsigned int avail_out);
>  
> -extern int (*dmg_uncompress_lzfse)(char *next_in, unsigned int avail_in,
> -                                   char *next_out, unsigned int avail_out);
> +int (*dmg_uncompress_lzfse)(char *next_in, unsigned int avail_in,
> +                            char *next_out, unsigned int avail_out);

These are variable declarations, so with this change you'll get multiple
copies of the variable if this header is included from multiple source
files. IOW, the 'extern' usage is correct.

> diff --git a/roms/seabios b/roms/seabios
> index ea1b7a0733..3208b098f5 160000
> --- a/roms/seabios
> +++ b/roms/seabios
> @@ -1 +1 @@
> -Subproject commit ea1b7a0733906b8425d948ae94fba63c32b1d425
> +Subproject commit 3208b098f51a9ef96d0dfa71d5ec3a3eaec88f0a

Nope !

With regards,
Daniel
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