linux-kernel - hppa vDSO and compiler (non-)support

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Message-ID: <d2713ae1-0ca5-9e5a-b7d2-b7d0f1f5614a@kernel.org>
Date:   Tue, 8 Mar 2022 12:06:55 +0100
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Helge Deller <deller@....de>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        linux-parisc@...r.kernel.org,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: hppa vDSO and compiler (non-)support

Hi,

since the "parisc: Add vDSO support" commit, I can no longer cross-build 
a hppa kernel. I see two issues:

1) CROSS32_COMPILE detection doesn't work here, as openSUSE provides 
hppa-suse-linux-* binaries. It's easy to overcome by 
"CROSS32_COMPILE=hppa-suse-linux-"

2) openSUSE doesn't provide any libc for hppa. So gcc doesn't provide 
libgcc.a and the build of vDSO fails.

So could vDSO be optional on hppa via KConfig?

I used to use the cross compiler to at least compile-check the following 
  tty drivers:
arch/parisc/kernel/pdc_cons.o
drivers/tty/serial/mux.o
drivers/tty/serial/8250/8250_gsc.o

thanks,
-- 
js
suse labs