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Re: [PATCH v4 10/12] xen/spinlock: split recursive spinlocks from normal ones
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Fri, 1 Mar 2024 15:37:25 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 01 Mar 2024 14:37:47 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 29.02.24 16:32, Jan Beulich wrote:
On 12.12.2023 10:47, Juergen Gross wrote:
+#define nrspin_lock_irqsave(l, f) \
+ ({ \
+ BUILD_BUG_ON(sizeof(f) != sizeof(unsigned long)); \
+ ((f) = __nrspin_lock_irqsave(l)); \
I don't think the outer pair of parentheses is needed here.
Turns out it is needed. Otherwise something like:
if ( a )
nrspin_lock_irqsave(l, f);
else
...
will fail with "else without a previous if".
Juergen
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