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From: Jan Beulich <jbeulich@suse.com>
To: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>,
	George Dunlap <george.dunlap@citrix.com>,
	Ian Jackson <iwj@xenproject.org>, Julien Grall <julien@xen.org>,
	Stefano Stabellini <sstabellini@kernel.org>, Wei Liu <wl@xen.org>
Subject: [PATCH v2 7/8] video/lfb: avoid effectively open-coding xzalloc_array()
Date: Wed, 21 Apr 2021 16:59:22 +0200	[thread overview]
Message-ID: <73db0f74-438e-d99f-35d7-76679df75e40@suse.com> (raw)
In-Reply-To: <091b4b91-712f-3526-78d1-80d31faf8e41@suse.com>

There is a difference in generated code: xzalloc_bytes() forces
SMP_CACHE_BYTES alignment. But if code really cared about such higher
than default alignment, it should request so explicitly rather than
using a type-unsafe interface. And if e.g. cache line sharing was a
concern, the allocator itself should arrange to avoid such.

Signed-off-by: Jan Beulich <jbeulich@suse.com>

--- a/xen/drivers/video/lfb.c
+++ b/xen/drivers/video/lfb.c
@@ -147,8 +147,9 @@ int __init lfb_init(struct lfb_prop *lfb
 {
     lfb.lfbp = *lfbp;
 
-    lfb.lbuf = xmalloc_bytes(lfb.lfbp.bytes_per_line);
-    lfb.text_buf = xzalloc_bytes(lfb.lfbp.text_columns * lfb.lfbp.text_rows);
+    lfb.lbuf = xmalloc_array(unsigned char, lfb.lfbp.bytes_per_line);
+    lfb.text_buf = xzalloc_array(unsigned char,
+                                 lfb.lfbp.text_columns * lfb.lfbp.text_rows);
     lfb.line_len = xzalloc_array(unsigned int, lfb.lfbp.text_columns);
 
     if ( !lfb.lbuf || !lfb.text_buf || !lfb.line_len )



  parent reply	other threads:[~2021-04-21 14:59 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-21 14:54 [PATCH v2 0/8] assorted replacement of x[mz]alloc_bytes() Jan Beulich
2021-04-21 14:56 ` [PATCH v2 1/8] x86/MCE: avoid effectively open-coding xmalloc_array() Jan Beulich
2021-04-21 14:56 ` [PATCH v2 2/8] x86/HVM: " Jan Beulich
2021-04-21 14:57 ` [PATCH v2 3/8] x86/oprofile: " Jan Beulich
2021-04-21 14:57 ` [PATCH v2 4/8] x86/IRQ: avoid over-alignment in alloc_pirq_struct() Jan Beulich
2021-04-21 14:58 ` [PATCH v2 5/8] EFI/runtime: avoid effectively open-coding x{m,z}alloc_array() Jan Beulich
2021-04-21 14:58 ` [PATCH v2 6/8] kexec: avoid effectively open-coding xzalloc_flex_struct() Jan Beulich
2021-04-21 14:59 ` Jan Beulich [this message]
2021-04-21 14:59 ` [PATCH v2 8/8] Arm/optee: don't open-code xzalloc_flex_struct() Jan Beulich
2021-05-03 13:53   ` Ping: " Jan Beulich
2021-05-04 23:49     ` Volodymyr Babchuk
2021-04-21 15:23 ` [PATCH v2 0/8] assorted replacement of x[mz]alloc_bytes() Andrew Cooper
2021-04-21 15:32   ` Jan Beulich
2021-04-23  9:44   ` Jan Beulich

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