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b=Q3iCK/wskmU2X7hkIWhpJyLWwu9ZWi+sB8uvRfb3Mtwfbb9MfE7d53l8Xl5IyUjir TNe2uY2hwhiCLP/zPspwKPRVJlC1Nca6dzZbDXpRBExAXDeq5kCdj+GEp/ObNTdRMY hq8smDF6QuL1pZqTPk87DywtWLLLCyXlrOolOhyI5ES5MgXfUK+Idobhy8QLzEC8e0 eA4MURci7szOKS39N9HuAEF0SstReoNm7zOEmyLe4vzcykBCwtZaQcN6f5yHDFPXnS cjUkIYroJVzjXt93zdIeqoJ5Sr06EqvnL0t3QrjhulPRd++vjLk60qbbhMLZhDM8s+ cVbwL0/FZNEaA== Message-ID: Date: Fri, 29 May 2026 09:47:17 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 4/4] vc_screen: replace __get_free_pages() with kmalloc() To: "Mike Rapoport (Microsoft)" , Greg Kroah-Hartman Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-serial@vger.kernel.org References: <20260528-b4-tty-v1-0-9da9f7aec5f2@kernel.org> <20260528-b4-tty-v1-4-9da9f7aec5f2@kernel.org> Content-Language: en-US From: Jiri Slaby Autocrypt: addr=jirislaby@kernel.org; keydata= xsFNBE6S54YBEACzzjLwDUbU5elY4GTg/NdotjA0jyyJtYI86wdKraekbNE0bC4zV+ryvH4j rrcDwGs6tFVrAHvdHeIdI07s1iIx5R/ndcHwt4fvI8CL5PzPmn5J+h0WERR5rFprRh6axhOk rSD5CwQl19fm4AJCS6A9GJtOoiLpWn2/IbogPc71jQVrupZYYx51rAaHZ0D2KYK/uhfc6neJ i0WqPlbtIlIrpvWxckucNu6ZwXjFY0f3qIRg3Vqh5QxPkojGsq9tXVFVLEkSVz6FoqCHrUTx wr+aw6qqQVgvT/McQtsI0S66uIkQjzPUrgAEtWUv76rM4ekqL9stHyvTGw0Fjsualwb0Gwdx ReTZzMgheAyoy/umIOKrSEpWouVoBt5FFSZUyjuDdlPPYyPav+hpI6ggmCTld3u2hyiHji2H cDpcLM2LMhlHBipu80s9anNeZhCANDhbC5E+NZmuwgzHBcan8WC7xsPXPaiZSIm7TKaVoOcL 9tE5aN3jQmIlrT7ZUX52Ff/hSdx/JKDP3YMNtt4B0cH6ejIjtqTd+Ge8sSttsnNM0CQUkXps w98jwz+Lxw/bKMr3NSnnFpUZaxwji3BC9vYyxKMAwNelBCHEgS/OAa3EJoTfuYOK6wT6nadm YqYjwYbZE5V/SwzMbpWu7Jwlvuwyfo5mh7w5iMfnZE+vHFwp/wARAQABzSFKaXJpIFNsYWJ5 IDxqaXJpc2xhYnlAa2VybmVsLm9yZz7CwXcEEwEIACEFAlW3RUwCGwMFCwkIBwIGFQgJCgsC BBYCAwECHgECF4AACgkQvSWxBAa0cEnVTg//TQpdIAr8Tn0VAeUjdVIH9XCFw+cPSU+zMSCH eCZoA/N6gitEcnvHoFVVM7b3hK2HgoFUNbmYC0RdcSc80pOF5gCnACSP9XWHGWzeKCARRcQR 4s5YD8I4VV5hqXcKo2DFAtIOVbHDW+0okOzcecdasCakUTr7s2fXz97uuoc2gIBB7bmHUGAH XQXHvdnCLjDjR+eJN+zrtbqZKYSfj89s/ZHn5Slug6w8qOPT1sVNGG+eWPlc5s7XYhT9z66E l5C0rG35JE4PhC+tl7BaE5IwjJlBMHf/cMJxNHAYoQ1hWQCKOfMDQ6bsEr++kGUCbHkrEFwD UVA72iLnnnlZCMevwE4hc0zVhseWhPc/KMYObU1sDGqaCesRLkE3tiE7X2cikmj/qH0CoMWe gjnwnQ2qVJcaPSzJ4QITvchEQ+tbuVAyvn9H+9MkdT7b7b2OaqYsUP8rn/2k1Td5zknUz7iF oJ0Z9wPTl6tDfF8phaMIPISYrhceVOIoL+rWfaikhBulZTIT5ihieY9nQOw6vhOfWkYvv0Dl o4GRnb2ybPQpfEs7WtetOsUgiUbfljTgILFw3CsPW8JESOGQc0Pv8ieznIighqPPFz9g+zSu Ss/rpcsqag5n9rQp/H3WW5zKUpeYcKGaPDp/vSUovMcjp8USIhzBBrmI7UWAtuedG9prjqfO wU0ETpLnhgEQAM+cDWLL+Wvc9cLhA2OXZ/gMmu7NbYKjfth1UyOuBd5emIO+d4RfFM02XFTI t4MxwhAryhsKQQcA4iQNldkbyeviYrPKWjLTjRXT5cD2lpWzr+Jx7mX7InV5JOz1Qq+P+nJW YIBjUKhI03ux89p58CYil24Zpyn2F5cX7U+inY8lJIBwLPBnc9Z0An/DVnUOD+0wIcYVnZAK DiIXODkGqTg3fhZwbbi+KAhtHPFM2fGw2VTUf62IHzV+eBSnamzPOBc1XsJYKRo3FHNeLuS8 f4wUe7bWb9O66PPFK/RkeqNX6akkFBf9VfrZ1rTEKAyJ2uqf1EI1olYnENk4+00IBa+BavGQ 8UW9dGW3nbPrfuOV5UUvbnsSQwj67pSdrBQqilr5N/5H9z7VCDQ0dhuJNtvDSlTf2iUFBqgk 3smln31PUYiVPrMP0V4ja0i9qtO/TB01rTfTyXTRtqz53qO5dGsYiliJO5aUmh8swVpotgK4 /57h3zGsaXO9PGgnnAdqeKVITaFTLY1ISg+Ptb4KoliiOjrBMmQUSJVtkUXMrCMCeuPDGHo7 39Xc75lcHlGuM3yEB//htKjyprbLeLf1y4xPyTeeF5zg/0ztRZNKZicgEmxyUNBHHnBKHQxz 1j+mzH0HjZZtXjGu2KLJ18G07q0fpz2ZPk2D53Ww39VNI/J9ABEBAAHCwV8EGAECAAkFAk6S 54YCGwwACgkQvSWxBAa0cEk3tRAAgO+DFpbyIa4RlnfpcW17AfnpZi9VR5+zr496n2jH/1ld wRO/S+QNSA8qdABqMb9WI4BNaoANgcg0AS429Mq0taaWKkAjkkGAT7mD1Q5PiLr06Y/+Kzdr 90eUVneqM2TUQQbK+Kh7JwmGVrRGNqQrDk+gRNvKnGwFNeTkTKtJ0P8jYd7P1gZb9Fwj9YLx jhn/sVIhNmEBLBoI7PL+9fbILqJPHgAwW35rpnq4f/EYTykbk1sa13Tav6btJ+4QOgbcezWI wZ5w/JVfEJW9JXp3BFAVzRQ5nVrrLDAJZ8Y5ioWcm99JtSIIxXxt9FJaGc1Bgsi5K/+dyTKL wLMJgiBzbVx8G+fCJJ9YtlNOPWhbKPlrQ8+AY52Aagi9WNhe6XfJdh5g6ptiOILm330mkR4g W6nEgZVyIyTq3ekOuruftWL99qpP5zi+eNrMmLRQx9iecDNgFr342R9bTDlb1TLuRb+/tJ98 f/bIWIr0cqQmqQ33FgRhrG1+Xml6UXyJ2jExmlO8JljuOGeXYh6ZkIEyzqzffzBLXZCujlYQ DFXpyMNVJ2ZwPmX2mWEoYuaBU0JN7wM+/zWgOf2zRwhEuD3A2cO2PxoiIfyUEfB9SSmffaK/ S4xXoB6wvGENZ85Hg37C7WDNdaAt6Xh2uQIly5grkgvWppkNy4ZHxE+jeNsU7tg= In-Reply-To: <20260528-b4-tty-v1-4-9da9f7aec5f2@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 91C1F2000A X-Stat-Signature: 9y9jri4odrn8y7hhx53do8xnqrixfk1y X-HE-Tag: 1780040841-599381 X-HE-Meta: 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 CRwFB4kE mBJRRWix8oTR1US4aAorF1HGUUhPv1uq9oo3KzxQ+Dt4tN9WdsEKLUBm8tj+51BTE/irNcIZQp/ZluPz+91G7hsCRs2k+rnbxwKhJr3c/9cEe9e/7smYEMfDhySRILd3KQThoiXm9TrxNeQA4d6nFVMrh3lq+J7/ZnEwa/cCSbUWG/Kjf6VO51pnf/T7sNv8/U3gE+abfaZq2GlCeHz40H3Br0+VKn8mLQ4DsQ3+qLF3vElbCTm68ww6DpGyhbx2+QgTPWrMtNk7NLhk5JKbJVcGYutg+CAiRlY8eU+y4cHuOfwJcr/HxAmn94jLlvX0gBSenTfhhCMhoFEBWIj7ufrr2YxN01qf0KI9g Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 28. 05. 26, 12:24, Mike Rapoport (Microsoft) wrote: > vcs_read() and vcs_write() allocate staging buffers with > __get_free_pages(). > > These buffers can be allocated with kmalloc() as there's nothing special > about them to go directly to the page allocator. > > kmalloc() provides a better API that does not require ugly casts and it's a > modern way of saying "I need a page-sized buffer" > > Replace use of __get_free_page() with kmalloc() and drop unused now > DEFINE_FREE(free_page_ptr ...) > > Link: https://lore.kernel.org/all/700c5a5f-3128-4671-99aa-827ca73f5cdf@kernel.org > Link: https://lore.kernel.org/all/635405e4-9423-4a25-a6e7-e03c8ea0bcbe@redhat.com > Signed-off-by: Mike Rapoport (Microsoft) > --- > drivers/tty/vt/vc_screen.c | 6 ++---- > 1 file changed, 2 insertions(+), 4 deletions(-) > > diff --git a/drivers/tty/vt/vc_screen.c b/drivers/tty/vt/vc_screen.c > index 4d2d46c95fef..386c80efc672 100644 > --- a/drivers/tty/vt/vc_screen.c > +++ b/drivers/tty/vt/vc_screen.c > @@ -53,8 +53,6 @@ > #define HEADER_SIZE 4u > #define CON_BUF_SIZE (IS_ENABLED(CONFIG_BASE_SMALL) ? 256 : PAGE_SIZE) > > -DEFINE_FREE(free_page_ptr, void *, if (_T) free_page((unsigned long)_T)); > - Indeed, I don't know why I came up with this in the first place :P. Reviewed-by: Jiri Slaby > @@ -371,7 +369,7 @@ vcs_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) > loff_t pos; > bool viewed, attr, uni_mode; > > - char *con_buf __free(free_page_ptr) = (char *)__get_free_page(GFP_KERNEL); > + char *con_buf __free(kfree) = kmalloc(PAGE_SIZE, GFP_KERNEL); > if (!con_buf) > return -ENOMEM; > > @@ -596,7 +594,7 @@ vcs_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) > if (use_unicode(inode)) > return -EOPNOTSUPP; > > - char *con_buf __free(free_page_ptr) = (char *)__get_free_page(GFP_KERNEL); > + char *con_buf __free(kfree) = kmalloc(PAGE_SIZE, GFP_KERNEL); > if (!con_buf) > return -ENOMEM; > > -- js suse labs