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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi Thomas, On 10/04/2026 13:18, Thomas Gleixner wrote: > The header define in asm/timex,h and the naming of the function to read the > delay timer are confusing at best. > > Convert it to a config switch selected by the archictures, which provide > the functionality, and rename the function to delay_read_timer(), which > makes the purpose clear. Move the declaration to linux/delay.h where it > belongs. > > Remove the resulting empty asm/timex.h files as well. > > No functional change. > > Signed-off-by: Thomas Gleixner > Cc: Arnd Bergmann ... > --- a/arch/arm/include/asm/timex.h > +++ b/arch/arm/include/asm/timex.h > @@ -10,7 +10,10 @@ > #define _ASMARM_TIMEX_H > > typedef unsigned long cycles_t; > -#define get_cycles() ({ cycles_t c; read_current_timer(&c) ? 0 : c; }) > +// Temporary workaround > +bool delay_read_timer(unsigned long *t); > + > +#define get_cycles() ({ cycles_t c; delay_read_timer(&c) ? 0 : c; }) > #define random_get_entropy() (((unsigned long)get_cycles()) ?: random_get_entropy_fallback()) I have noticed a boot regression on some of our 32-bit Tegra platforms. Bisect is pointing to this commit. Making the following change does fix it, as delay_read_timer() now returns a valid value when true ... diff --git a/arch/arm/include/asm/timex.h b/arch/arm/include/asm/timex.h index 94e40c19cfc5..4d31eab9dba2 100644 --- a/arch/arm/include/asm/timex.h +++ b/arch/arm/include/asm/timex.h @@ -13,7 +13,7 @@ typedef unsigned long cycles_t; // Temporary workaround until timex.h is cleaned up bool delay_read_timer(unsigned long *t); -#define get_cycles() ({ cycles_t c; delay_read_timer(&c) ? 0 : c; }) +#define get_cycles() ({ cycles_t c; delay_read_timer(&c) ? c : 0; }) #define random_get_entropy() (((unsigned long)get_cycles()) ?: random_get_entropy_fallback()) Cheers Jon -- nvpublic