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Fri, 28 Aug 2026 15:12:45 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id GyVjNW2lkWq6VwAAD6G6ig (envelope-from ); Fri, 28 Aug 2026 15:12:45 +0000 Date: Fri, 28 Aug 2026 17:12:44 +0200 From: Cyril Hrubis To: Samir Mulani Message-ID: References: <20260820015708.46189-1-samir@linux.ibm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20260820015708.46189-1-samir@linux.ibm.com> X-Spamd-Result: default: False [-4.30 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; MISSING_XM_UA(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCPT_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.cz:email,imap1.dmz-prg2.suse.org:helo] X-Virus-Scanned: clamav-milter 1.0.9 at in-5.smtp.seeweb.it X-Virus-Status: Clean Subject: Re: [LTP] [PATCH v6] hugemmap43: Migrate truncate_sigbus_versus_oom from libhugetlbfs X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: ltp@lists.linux.it Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Hi! > +static void run_test(void) > +{ > + void *p, *q; > + unsigned long totpages; > + unsigned long i; > + > + test_pass = 0; > + > + fd = tst_creat_unlinked(MNTPOINT, 0, 0600); > + p = SAFE_MMAP(NULL, hpage_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); > + SAFE_FTRUNCATE(fd, 0); > + > + fdx = tst_creat_unlinked(MNTPOINT, 0, 0600); > + totpages = SAFE_READ_MEMINFO(MEMINFO_HPAGE_FREE); > + q = SAFE_MMAP(NULL, totpages * hpage_size, PROT_READ | PROT_WRITE, > + MAP_SHARED, fdx, 0); > + > + /* Touch the pages to ensure they're removed from the pool */ > + for (i = 0; i < totpages; i++) { > + volatile char *x = (volatile char *)q + i * hpage_size; > + *x = 0; > + } Why do we need two mappings? Shouldn't one mapping, faulted in then truncated suffice? -- Cyril Hrubis chrubis@suse.cz -- Mailing list info: https://lists.linux.it/listinfo/ltp