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b=E0zsCHKQLk4p8gAn3X8j4oy3KYslGMK/guDz3UOJRR2N9We0sVvbpFK/tqFZEs6hS QGZTNx4CYKtVtsv0C4c6LK+370dmf6vuYWyChytDHcZjngcrLBJRbI1EPFabmoqMSA qZY2m0BNqpRVODEnXYlMUDe3XKdhPYn1UADPoG0K7Kp5YbWUwTwJMx998EnYZp5x+E 7GFc412nEoX9MMCL8ZxJywrQM0nTSpoDEGJ7jQOSeDwqfeL2JHMR5tpX8WtDYELqbb 7IrVKjbr8LEORFSJMs8oYP5mXCSNx/j4l/PbFzx/kbmKrHsqq6Xbb9o6tQoUAyn5GT 6o2UQOGFJA4eA== Date: Thu, 3 Sep 2026 12:15:46 +0300 From: Mike Rapoport To: Eli Billauer Cc: Arnd Bergmann , Brad Warrum , Greg Kroah-Hartman , Michal Simek , Ritu Agarwal , Andrew Morton , David Hildenbrand , Matthew Wilcox , Vlastimil Babka , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org Subject: Re: [PATCH 2/4] char: xillybus: replace __get_free_pages() with kmalloc() Message-ID: References: <20260830-char-misc-v1-0-05e2ce44f291@kernel.org> <20260830-char-misc-v1-2-05e2ce44f291@kernel.org> <7adfefaa-91c5-4bf4-ff98-5dfbba0eac96@outbound.gmail.com> <2d7b127d-6079-40c0-2020-dc7767b2396b@outbound.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2d7b127d-6079-40c0-2020-dc7767b2396b@outbound.gmail.com> X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 05C6F20006 X-Stat-Signature: 76dxs4trzr48umi1jbrdjiupcprnt6yr X-Rspam-User: X-HE-Tag: 1788426954-617777 X-HE-Meta: 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 TzkskCs4 K9oq6ysQ0TisRrzBrznHJCbd4c/o0tXR/Dcjg+jbA0ZDDKU95F+UMCKYkjX+NjmhMexCse/ucXu5sdV/PrOwvo/bGMElWUhZT1yjnYDGfvRIkaHi94rAEhN/hkc9o+Jlw749y4kqXOWJ8GNmtc5oNLVqkHZ/pCL49+Bmlykji8NCx/9ITbY9r0ugPrWNl7x/F8/Gdo94DUhONHyPtD+J2BT+oqVNzRXoQ+tAVXPf65fDem48S4bzG2cuJ9MPtifXdz75d7FOwFxCtdvdY64OR19lyN7rptr1XWNUiUzcnPZlQCknolM77VT9LiuAZrtczT5jWApfIMdDCnviT+RFvHo+PIDMv/jo+d7BQfL9Vjr2FB63e6Xj7aInK3b+b7xxonkxe Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Sep 02, 2026 at 01:40:21PM +0200, Eli Billauer wrote: > On 01/09/2026 19:24, Mike Rapoport wrote: > > On Tue, Sep 01, 2026 at 10:42:47AM +0200, Eli Billauer wrote: > > > On 31/08/2026 13:32, Mike Rapoport wrote: > > > > For large sizes kmalloc falls back to page allocator anyway. > > > > > > > > And the doc is out of date unfortunately. > > > I think it would be a good idea to update the doc first, and by doing so > > > officially change the API. After getting this change approved, it's indeed > > > safe to rely on kmalloc() even for larger memory allocations. > > The documentation always lags behind the code and "official" API is what > > include/linux/slab.h says :) > > This is what I found in slab.h: > > * > * kmalloc is the normal method of allocating memory > * for objects smaller than page size in the kernel. > * Citing vbabka: that sentence doesn't exclude >PAGE_SIZE allocations :) > Regards, > Eli > -- Sincerely yours, Mike.