From: Arnd Bergmann arnd@arndb.de
[ Upstream commit 0c2baf6509af1d11310ae4c1c839481a6e9a4bc4 ]
On most architectures, gcc -Wextra warns about the list of error numbers containing both EDEADLK and EDEADLOCK:
lib/errname.c:15:67: warning: initialized field overwritten [-Woverride-init] 15 | #define E(err) [err + BUILD_BUG_ON_ZERO(err <= 0 || err > 300)] = "-" #err | ^~~ lib/errname.c:172:2: note: in expansion of macro 'E' 172 | E(EDEADLK), /* EDEADLOCK */ | ^
On parisc, a similar error happens with -ECANCELLED, which is an alias for ECANCELED.
Make the EDEADLK printing conditional on the number being distinct from EDEADLOCK, and remove the -ECANCELLED bit completely as it can never be hit.
To ensure these are correct, add static_assert lines that verify all the remaining aliases are in fact identical to the canonical name.
Fixes: 57f5677e535b ("printf: add support for printing symbolic error names") Cc: Petr Mladek pmladek@suse.com Suggested-by: Rasmus Villemoes linux@rasmusvillemoes.dk Acked-by: Uwe Kleine-König uwe@kleine-koenig.org Reviewed-by: Andy Shevchenko andy.shevchenko@gmail.com Link: https://lore.kernel.org/all/20210514213456.745039-1-arnd@kernel.org/ Link: https://lore.kernel.org/all/20210927123409.1109737-1-arnd@kernel.org/ Signed-off-by: Arnd Bergmann arnd@arndb.de Reviewed-by: Sergey Senozhatsky senozhatsky@chromium.org Acked-by: Rasmus Villemoes linux@rasmusvillemoes.dk Reviewed-by: Petr Mladek pmladek@suse.com Signed-off-by: Petr Mladek pmladek@suse.com Link: https://lore.kernel.org/r/20230206194126.380350-1-arnd@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- lib/errname.c | 22 ++++++++++++++-------- 1 file changed, 14 insertions(+), 8 deletions(-)
diff --git a/lib/errname.c b/lib/errname.c index 05cbf731545f0..67739b174a8cc 100644 --- a/lib/errname.c +++ b/lib/errname.c @@ -21,6 +21,7 @@ static const char *names_0[] = { E(EADDRNOTAVAIL), E(EADV), E(EAFNOSUPPORT), + E(EAGAIN), /* EWOULDBLOCK */ E(EALREADY), E(EBADE), E(EBADF), @@ -31,15 +32,17 @@ static const char *names_0[] = { E(EBADSLT), E(EBFONT), E(EBUSY), -#ifdef ECANCELLED - E(ECANCELLED), -#endif + E(ECANCELED), /* ECANCELLED */ E(ECHILD), E(ECHRNG), E(ECOMM), E(ECONNABORTED), + E(ECONNREFUSED), /* EREFUSED */ E(ECONNRESET), + E(EDEADLK), /* EDEADLOCK */ +#if EDEADLK != EDEADLOCK /* mips, sparc, powerpc */ E(EDEADLOCK), +#endif E(EDESTADDRREQ), E(EDOM), E(EDOTDOT), @@ -166,14 +169,17 @@ static const char *names_0[] = { E(EUSERS), E(EXDEV), E(EXFULL), - - E(ECANCELED), /* ECANCELLED */ - E(EAGAIN), /* EWOULDBLOCK */ - E(ECONNREFUSED), /* EREFUSED */ - E(EDEADLK), /* EDEADLOCK */ }; #undef E
+#ifdef EREFUSED /* parisc */ +static_assert(EREFUSED == ECONNREFUSED); +#endif +#ifdef ECANCELLED /* parisc */ +static_assert(ECANCELLED == ECANCELED); +#endif +static_assert(EAGAIN == EWOULDBLOCK); /* everywhere */ + #define E(err) [err - 512 + BUILD_BUG_ON_ZERO(err < 512 || err > 550)] = "-" #err static const char *names_512[] = { E(ERESTARTSYS),