| Message ID | 20181002205809.2300654-1-arnd@arndb.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | SUNRPC: use cmpxchg64() in gss_seq_send64_fetch_and_inc() | expand |
On Tue, 2018-10-02 at 22:57 +0200, Arnd Bergmann wrote: > The newly introduced gss_seq_send64_fetch_and_inc() fails to build on > 32-bit architectures: > > net/sunrpc/auth_gss/gss_krb5_seal.c:144:14: note: in expansion of > macro 'cmpxchg' > seq_send = cmpxchg(&ctx->seq_send64, old, old + 1); > ^~~~~~~ > arch/x86/include/asm/cmpxchg.h:128:3: error: call to > '__cmpxchg_wrong_size' declared with attribute error: Bad argument > size for cmpxchg > __cmpxchg_wrong_size(); \ > > As the message tells us, cmpxchg() cannot be used on 64-bit > arguments, > that's what cmpxchg64() does. > > Fixes: 571ed1fd2390 ("SUNRPC: Replace krb5_seq_lock with a lockless > scheme") > Signed-off-by: Arnd Bergmann <arnd@arndb.de> > --- > net/sunrpc/auth_gss/gss_krb5_seal.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/net/sunrpc/auth_gss/gss_krb5_seal.c > b/net/sunrpc/auth_gss/gss_krb5_seal.c > index 92594681d619..5775b9805bdc 100644 > --- a/net/sunrpc/auth_gss/gss_krb5_seal.c > +++ b/net/sunrpc/auth_gss/gss_krb5_seal.c > @@ -141,7 +141,7 @@ gss_seq_send64_fetch_and_inc(struct krb5_ctx > *ctx) > > do { > old = seq_send; > - seq_send = cmpxchg(&ctx->seq_send64, old, old + 1); > + seq_send = cmpxchg64(&ctx->seq_send64, old, old + 1); > } while (old != seq_send); > return seq_send; > } Thanks Arndt! Applied.
diff --git a/net/sunrpc/auth_gss/gss_krb5_seal.c b/net/sunrpc/auth_gss/gss_krb5_seal.c index 92594681d619..5775b9805bdc 100644 --- a/net/sunrpc/auth_gss/gss_krb5_seal.c +++ b/net/sunrpc/auth_gss/gss_krb5_seal.c @@ -141,7 +141,7 @@ gss_seq_send64_fetch_and_inc(struct krb5_ctx *ctx) do { old = seq_send; - seq_send = cmpxchg(&ctx->seq_send64, old, old + 1); + seq_send = cmpxchg64(&ctx->seq_send64, old, old + 1); } while (old != seq_send); return seq_send; }
The newly introduced gss_seq_send64_fetch_and_inc() fails to build on 32-bit architectures: net/sunrpc/auth_gss/gss_krb5_seal.c:144:14: note: in expansion of macro 'cmpxchg' seq_send = cmpxchg(&ctx->seq_send64, old, old + 1); ^~~~~~~ arch/x86/include/asm/cmpxchg.h:128:3: error: call to '__cmpxchg_wrong_size' declared with attribute error: Bad argument size for cmpxchg __cmpxchg_wrong_size(); \ As the message tells us, cmpxchg() cannot be used on 64-bit arguments, that's what cmpxchg64() does. Fixes: 571ed1fd2390 ("SUNRPC: Replace krb5_seq_lock with a lockless scheme") Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- net/sunrpc/auth_gss/gss_krb5_seal.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)