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bh=0DN55bSNTQFajH9UQ/ZPWNclui6hp3/dzUXrzibB4e8=; b=nLmjDCn+I8gKh1U6nup+PQOxkEIwwA5YaBFi6iv6Gi5SbuROVA4VgAny39IDeH9hZ1JIQ8 EyXyXzpJpX/zbwOacFeMw7mwuu5JzGhbiF3b6RR9Z84ox2bKX4mQ8A3vzrtXzfGBaS3iLF Cs8jqOSO0AAzGHfLGrTEQfh8pWo3hIS+DryuDfi/hymJ+UPWBQ1C6mtyxd2UBUCOTDg6+e C+nyAZjsFz4+vfmpD2nmBOxt79GsU5KmChWDSMiVHGibjjjmDI2eUGR/Wp1lR12f4VYvxg heyez4urTQwcjMyfhUU6StPikyikmalcdrZoy6u3pWJ2urIt1PlpN7vCr6U8ow== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1680601099; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=0DN55bSNTQFajH9UQ/ZPWNclui6hp3/dzUXrzibB4e8=; b=mNm+u/MFMwBwZ9t9EQ2Tsp/yvJ1Qa/SQNUQVXZL4K1u6JA/OW/xTAlSZ/ut0IGMFqy/BPV fQl1nyKmy3SgrbBQ== To: Ankur Arora , linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org, luto@kernel.org, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com, juri.lelli@redhat.com, willy@infradead.org, mgorman@suse.de, peterz@infradead.org, rostedt@goodmis.org, vincent.guittot@linaro.org, jon.grimm@amd.com, bharata@amd.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com, ankur.a.arora@oracle.com Subject: Re: [PATCH 8/9] irqentry: define irqentry_exit_allow_resched() In-Reply-To: <20230403052233.1880567-9-ankur.a.arora@oracle.com> References: <20230403052233.1880567-1-ankur.a.arora@oracle.com> <20230403052233.1880567-9-ankur.a.arora@oracle.com> Date: Tue, 04 Apr 2023 11:38:18 +0200 Message-ID: <87pm8kq96d.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain X-Rspamd-Queue-Id: 7096EC0003 X-Rspamd-Server: rspam09 X-Rspam-User: X-Stat-Signature: oxwy8awq76opq6qrrgjaigfss3f51cj6 X-HE-Tag: 1680601101-971468 X-HE-Meta: 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 t0AuJWBC YgAgHYJZNCVeDi1Cgm4ZWGkQAeX/sBe51x91MwgH/RHE972eLaa79m76rHdlViKdCv3vluhQEnGnPdhr2uuruXZ6YvCO8az+ko4qN+98gRJRp3x8= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sun, Apr 02 2023 at 22:22, Ankur Arora wrote: > Allow threads marked TIF_ALLOW_RESCHED to be rescheduled in irqexit. > > This is only necessary under !preempt_model_preemptible() for which > we reuse the same logic as irqentry_exit_code_resched(). This tells what this patch is doing but completely fails to explain why this is necessary and useful. Thanks, tglx