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Date: Wed, 04 Dec 2013 08:54:31 -0800 From: "H. Peter Anvin" <hpa@...or.com> To: Oleg Nesterov <oleg@...hat.com> CC: Linus Torvalds <torvalds@...ux-foundation.org>, Hugh Dickins <hughd@...gle.com>, Peter Zijlstra <peterz@...radead.org>, Jiri Kosina <jkosina@...e.cz>, Andi Kleen <andi@...stfloor.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, the arch/x86 maintainers <x86@...nel.org>, Andi Kleen <ak@...ux.intel.com>, Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de> Subject: Re: [PATCH?] uprobes: change uprobe_write_opcode() to modify the page directly On 12/04/2013 08:48 AM, Oleg Nesterov wrote: > On 12/04, H. Peter Anvin wrote: >> >> On 12/04/2013 03:11 AM, Oleg Nesterov wrote: >>> >>> It is still not clear to me if we can simply change a single byte on >>> x86 or not, but at least on powerpc we need to update 4 bytes. Perhaps >>> we can conditionalize these pte games later. >>> >> >> But 4 aligned bytes can be written as a single transaction. > > Ah yes, this is true. > That is why I talk about the atomic instruction word... most (but not *all*) architectures have a fundamental minimum unit of instructions which is aligned and can be atomically written. Typically this is 1, 2, or 4 bytes. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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