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13 June 2022, 11:31:42 UTC
Revision 66f93c5a02d5ba6ef17fef459143961382593212 authored by Nicholas Piggin on 15 November 2018, 02:34:27 UTC, committed by Michael Ellerman on 15 November 2018, 03:48:43 UTC 
powerpc/64: Fix kernel stack 16-byte alignment
 
Commit 4c2de74cc869 ("powerpc/64: Interrupts save PPR on stack rather
than thread_struct") changed sizeof(struct pt_regs) % 16 from 0 to 8,
which causes the interrupt frame allocation on kernel entry to put the
kernel stack out of alignment.

Quadword (16-byte) alignment for the stack is required by both the
64-bit v1 ABI (v1.9 § 3.2.2) and the 64-bit v2 ABI (v1.1 § 2.2.2.1).

Add a pad field to fix alignment, and add a BUILD_BUG_ON to catch this
in future.

Fixes: 4c2de74cc869 ("powerpc/64: Interrupts save PPR on stack rather than thread_struct")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
1 parent 437ccdc
History
Tip revision: 66f93c5a02d5ba6ef17fef459143961382593212 authored by Nicholas Piggin on 15 November 2018, 02:34:27 UTC
powerpc/64: Fix kernel stack 16-byte alignment
Tip revision: 66f93c5
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