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SubjectRe: inline asm semantics: output constraint width smaller than input
Date
Török Edwin <edwintorok@gmail.com> writes:

> @@ -239,11 +239,13 @@ extern void __put_user_8(void);
> */
> #define put_user(x, ptr) \
> ({ \
> - int __ret_pu; \
> + __typeof__(*(ptr)) __ret_pu; \
> __typeof__(*(ptr)) __pu_val; \
> __chk_user_ptr(ptr); \
> might_fault(); \
> __pu_val = x; \
> + /* return value is 0 or -EFAULT, both fit in 1 byte, and \
> + * are sign-extendable to int */ \

That does not work when *ptr is unsigned (char or short).

Andreas.

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Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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