| Subject | Re: [patch V2 17/17] lib/vdso: Allow architectures to provide the vdso data pointer | From | Vincenzo Frascino <> | Date | Mon, 17 Feb 2020 12:09:26 +0000 |
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On 07/02/2020 12:39, Thomas Gleixner wrote: > From: Christophe Leroy <christophe.leroy@c-s.fr> > > On powerpc, __arch_get_vdso_data() clobbers the link register, requiring > the caller to save it. > > As the parent function already has to set a stack frame and saves the link > register before calling the C vdso function, retrieving the vdso data > pointer there is less overhead. > > Split out the functional code from the __cvdso.*() interfaces into new > static functions which can either be called from the existing interfaces > with the vdso data pointer supplied via __arch_get_vdso_data() or directly > from ASM code. > > Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> > Signed-off-by: Thomas Gleixner <tglx@linutronix.de> > Link: https://lore.kernel.org/r/abf97996602ef07223fec30c005df78e5ed41b2e.1580399657.git.christophe.leroy@c-s.fr > Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
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-- Regards, Vincenzo [unhandled content-type:application/pgp-keys] |